API.html 103 KB

Raw Blame History Permalink

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="Author" content="MMclaughlin">
  <title>decimal.js API</title>
  <style>
html{font-size:100%}
body{background:#fff;font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px;
  line-height:1.65em;min-height:100%;margin:0}
body,i{color:#000}
.nav{background:#fff;position:fixed;top:0;bottom:0;left:0;width:210px;overflow-y:auto;
  padding:15px 0 30px 15px}
div.container{width:600px;margin:50px 0 50px 240px}
p{margin:0 0 1em;width:600px}
pre,ul{margin:1em 0}
h1,h2,h3,h4,h5{margin:0;padding:1.5em 0 0}
h1,h2{padding:.75em 0}
h1{font:400 3em Consolas, monaco, monospace;color:#000;margin-bottom:1em}
h2{font-size:2.25em;color:#f00}
h3{font-size:1.75em;color:#69d2e7}
h4{font-size:1.75em;color:#f00;padding-bottom:.75em}
h5{font-size:1.2em;margin-bottom:.4em}
h6{font-size:1.1em;margin-bottom:0.8em;padding:0.5em 0}
dd dt{font-size:1.2em}
dt{padding-top:.5em}
dd{padding-top:.35em}
b{font-weight:700}
a,a:visited{color:#f00;text-decoration:none}
a:active,a:hover{outline:0;text-decoration:underline}
.nav a,.nav b,.nav a:visited{display:block;color:#f00;font-weight:700;margin-top:15px}
.nav b{color:#69d2e7;margin-top:20px;cursor:default;width:auto}
ul{list-style-type:none;padding:0 0 0 20px}
.nav ul{line-height:14px;padding-left:0;margin:5px 0 0}
.nav ul a,.nav ul a:visited,span{display:inline;color:#000;font-family:Verdana,Geneva,sans-serif;
  font-size:11px;font-weight:400;margin:0}
.inset{margin-left:20px;font-size:.9em}
.nav li{width:auto;margin:0 0 3px}
.alias{font-style:italic;margin-left:20px}
table{border-collapse:collapse;border-spacing:0;border:2px solid #a7dbd8;margin:1.75em 0;padding:0}
td,th{text-align:left;margin:0;padding:2px 5px;border:1px dotted #a7dbd8}
th{border-top:2px solid #a7dbd8;border-bottom:2px solid #a7dbd8;color:#f00}
code,pre{font-family:Consolas, monaco, monospace;font-weight:400}
pre{background:#f5f5f5;white-space:pre-wrap;word-wrap:break-word;border-left:5px solid #a7dbd8;
  padding:1px 0 1px 15px;margin:1.2em 0}
code,.nav-title{color:#f00}
.end{margin-bottom:25px}
.centre{text-align:center}
#modes,#configProps{color:#f00}
.spacer{line-height:0px}
#faq{margin:3em 0 0}
li span{float:right;margin-right:10px;color:#c0c0c0}
#js{font:inherit;color:#f00}
  </style>
</head>
<body>

  <div class="nav">

    <a class='nav-title' href="#">API</a>

    <b>CONSTRUCTOR</b>
    <ul><li><a href="#decimal"><strong>Decimal</strong></a></li></ul>

    <a href="#methods">Methods</a>
    <ul>
      <li><a href="#Dabs"       >abs</a></li>
      <li><a href="#Dacos"      >acos</a></li>
      <li><a href="#Dacosh"     >acosh</a></li>
      <li><a href="#Dadd"       >add</a></li>
      <li><a href="#Dasin"      >asin</a></li>
      <li><a href="#Dasinh"     >asinh</a></li>
      <li><a href="#Datan"      >atan</a></li>
      <li><a href="#Datanh"     >atanh</a></li>
      <li><a href="#Datan2"     >atan2</a></li>
      <li><a href="#Dcbrt"      >cbrt</a></li>
      <li><a href="#Dceil"      >ceil</a></li>
      <li><a href="#Dclone"     >clone</a></li>
      <li><a href="#Dcos"       >cos</a></li>
      <li><a href="#Dcosh"      >cosh</a></li>
      <li><a href="#Ddiv"       >div</a></li>
      <li><a href="#Dexp"       >exp</a></li>
      <li><a href="#Dfloor"     >floor</a></li>
      <li><a href="#Dhypot"     >hypot</a></li>
      <li><a href="#DisDecimal" >isDecimal</a></li>
      <li><a href="#Dln"        >ln</a></li>
      <li><a href="#Dlog"       >log</a></li>
      <li><a href="#Dlog2"      >log2</a></li>
      <li><a href="#Dlog10"     >log10</a></li>
      <li><a href="#Dmax"       >max</a></li>
      <li><a href="#Dmin"       >min</a></li>
      <li><a href="#Dmod"       >mod</a></li>
      <li><a href="#Dmul"       >mul</a></li>
      <li><a href="#DnoConflict">noConflict</a></li>
      <li><a href="#Dpow"       >pow</a></li>
      <li><a href="#Drandom"    >random</a></li>
      <li><a href="#Dround"     >round</a></li>
      <li><a href="#Dset"       >set</a></li>
      <li><a href="#Dsign"      >sign</a></li>
      <li><a href="#Dsin"       >sin</a></li>
      <li><a href="#Dsinh"      >sinh</a></li>
      <li><a href="#Dsqrt"      >sqrt</a></li>
      <li><a href="#Dsub"       >sub</a></li>
      <li><a href="#Dtan"       >tan</a></li>
      <li><a href="#Dtanh"      >tanh</a></li>
      <li><a href="#Dtrunc"     >trunc</a></li>
    </ul>

    <a href="#constructor-properties">Properties</a>
    <ul>
      <li><a href="#precision">precision</a></li>
      <li><a href="#rounding" >rounding</a></li>
      <li><a href="#minE"     >minE</a></li>
      <li><a href="#maxE"     >maxE</a></li>
      <li><a href="#toExpNeg" >toExpNeg</a></li>
      <li><a href="#toExpPos" >toExpPos</a></li>
      <li><a href="#modulo"   >modulo</a></li>
      <li><a href="#crypto"   >crypto</a></li>
      <li class='spacer'>&nbsp;</li>
      <li><a href="#modes">ROUND_UP</a></li>
      <li><a href="#modes">ROUND_DOWN</a></li>
      <li><a href="#modes">ROUND_CEIL</a></li>
      <li><a href="#modes">ROUND_FLOOR</a></li>
      <li><a href="#modes">ROUND_HALF_UP</a></li>
      <li><a href="#modes">ROUND_HALF_DOWN</a></li>
      <li><a href="#modes">ROUND_HALF_EVEN</a></li>
      <li><a href="#modes">ROUND_HALF_CEIL</a></li>
      <li><a href="#modes">ROUND_HALF_FLOOR</a></li>
      <li><a href="#modes">EUCLID</a></li>
    </ul>

    <b> INSTANCE </b>

    <a href="#prototype-methods">Methods</a>
    <ul>
      <li><a href="#abs"          >absoluteValue           </a><span>abs</span>     </li>
      <li><a href="#ceil"         >ceil                    </a>                     </li>
      <li><a href="#cmp"          >comparedTo              </a><span>cmp</span>     </li>
      <li><a href="#cos"          >cosine                  </a><span>cos</span>     </li>
      <li><a href="#cbrt"         >cubeRoot                </a><span>cbrt</span>    </li>
      <li><a href="#dp"           >decimalPlaces           </a><span>dp</span>      </li>
      <li><a href="#div"          >dividedBy               </a><span>div</span>     </li>
      <li><a href="#divToInt"     >dividedToIntegerBy      </a><span>divToInt</span></li>
      <li><a href="#eq"           >equals                  </a><span>eq</span>      </li>
      <li><a href="#floor"        >floor                   </a>                     </li>
      <li><a href="#gt"           >greaterThan             </a><span>gt</span>      </li>
      <li><a href="#gte"          >greaterThanOrEqualTo    </a><span>gte</span>     </li>
      <li><a href="#cosh"         >hyperbolicCosine        </a><span>cosh</span>    </li>
      <li><a href="#sinh"         >hyperbolicSine          </a><span>sinh</span>    </li>
      <li><a href="#tanh"         >hyperbolicTangent       </a><span>tanh</span>    </li>
      <li><a href="#acos"         >inverseCosine           </a><span>acos</span>    </li>
      <li><a href="#acosh"        >inverseHyperbolicCosine </a><span>acosh</span>   </li>
      <li><a href="#asinh"        >inverseHyperbolicSine   </a><span>asinh</span>   </li>
      <li><a href="#atanh"        >inverseHyperbolicTangent</a><span>atanh</span>   </li>
      <li><a href="#asin"         >inverseSine             </a><span>asin</span>    </li>
      <li><a href="#atan"         >inverseTangent          </a><span>atan</span>    </li>
      <li><a href="#isFinite"     >isFinite                </a>                     </li>
      <li><a href="#isInt"        >isInteger               </a><span>isInt</span>   </li>
      <li><a href="#isNaN"        >isNaN                   </a>                     </li>
      <li><a href="#isNeg"        >isNegative              </a><span>isNeg</span>   </li>
      <li><a href="#isPos"        >isPositive              </a><span>isPos</span>   </li>
      <li><a href="#isZero"       >isZero                  </a>                     </li>
      <li><a href="#lt"           >lessThan                </a><span>lt</span>      </li>
      <li><a href="#lte"          >lessThanOrEqualTo       </a><span>lte</span>     </li>
      <li><a href="#log"          >logarithm               </a><span>log</span>     </li>
      <li><a href="#sub"          >minus                   </a><span>sub</span>     </li>
      <li><a href="#mod"          >modulo                  </a><span>mod</span>     </li>
      <li><a href="#exp"          >naturalExponential      </a><span>exp</span>     </li>
      <li><a href="#ln"           >naturalLogarithm        </a><span>ln</span>      </li>
      <li><a href="#neg"          >negated                 </a><span>neg</span>     </li>
      <li><a href="#add"          >plus                    </a><span>add</span>     </li>
      <li><a href="#sd"           >precision               </a><span>sd</span>      </li>
      <li><a href="#round"        >round                   </a>                     </li>
      <li><a href="#sin"          >sine                    </a><span>sin</span>     </li>
      <li><a href="#sqrt"         >squareRoot              </a><span>sqrt</span>    </li>
      <li><a href="#tan"          >tangent                 </a><span>tan</span>     </li>
      <li><a href="#mul"          >times                   </a><span>mul</span>     </li>
      <li><a href="#toBinary"     >toBinary                </a>                     </li>
      <li><a href="#toDP"         >toDecimalPlaces         </a><span>toDP</span>    </li>
      <li><a href="#toExponential">toExponential           </a>                     </li>
      <li><a href="#toFixed"      >toFixed                 </a>                     </li>
      <li><a href="#toFraction"   >toFraction              </a>                     </li>
      <li><a href="#toHex"        >toHexadecimal           </a><span>toHex</span>   </li>
      <li><a href="#toJSON"       >toJSON                  </a>                     </li>
      <li><a href="#toNearest"    >toNearest               </a>                     </li>
      <li><a href="#toNumber"     >toNumber                </a>                     </li>
      <li><a href="#toOctal"      >toOctal                 </a>                     </li>
      <li><a href="#pow"          >toPower                 </a><span>pow</span>     </li>
      <li><a href="#toPrecision"  >toPrecision             </a>                     </li>
      <li><a href="#toSD"         >toSignificantDigits     </a><span>toSD</span>    </li>
      <li><a href="#toString"     >toString                </a>                     </li>
      <li><a href="#trunc"        >truncated               </a><span>trunc</span>   </li>
      <li><a href="#valueOf"      >valueOf                 </a>                     </li>
    </ul>

    <a href="#instance-properties">Properties</a>
    <ul>
      <li><a href="#digits"   >d</a><span>digits</span></li>
      <li><a href="#exponent" >e</a><span>exponent</span></li>
      <li><a href="#sign"     >s</a><span>sign</span></li>
    </ul>

    <a href="#zero-nan-infinity">Zero, NaN &amp; Infinity</a>
    <a href="#Errors">Errors</a>
    <a href="#Pi">Pi</a>
    <a class='end' href="#faq">FAQ</a>

  </div>

  <div class="container">

    <h1>decimal<span id='js'>.js</span></h1>

    <p>An arbitrary-precision Decimal type for JavaScript.</p>
    <p><a href='https://github.com/MikeMcl/decimal.js'>Hosted on GitHub</a>.</p>

    <h2>API</h2>

    <p>
      See the <a href='https://github.com/MikeMcl/decimal.js'>README</a> on GitHub for a quick-start
      introduction.
    </p>
    <p>
      In all examples below, <code>var</code> and semicolons are not shown, and if a commented-out
      value is in quotes it means <code>toString</code> has been called on the preceding expression.
    </p><br />
    <p>
      When the library is loaded, it defines a single function object,
      <a href='#decimal'><code>Decimal</code></a>, the constructor of Decimal instances.
    </p>
    <p>
      <i>
        If necessary, multiple Decimal constructors can be created, each with their own independent
        configuration, e.g. precision and range, which applies to all Decimal instances created from
        it.
      </i>
    </p>
    <p>
      <i>
        A new Decimal constructor is created by calling the <code><a href='#Dclone'>clone</a></code>
        method of an already existing Decimal constructor.
      </i>
    </p>


    <h3 class='end'>CONSTRUCTOR</h3>

    <h5 id="decimal">
      Decimal<code class='inset'>Decimal(value) <i>&rArr; Decimal</i></code>
    </h5>
    <dl>
      <dt><code>value</code>: <i>number|string|Decimal</i></dt>
      <dd>
        A legitimate <code>value</code> is an integer or float, including <code>&plusmn;0</code>, or
        is <code>&plusmn;Infinity</code>, or <code>NaN</code>.
      </dd>
      <dd>
        The number of digits of <code>value</code> is not limited, except by JavaScript's maximum
        array size and, in practice, the processing time required.
      </dd>
      <dd>
        The allowable range of <code>value</code> is defined in terms of a maximum exponent, see
        <a href='#maxE'>maxE</a>, and a minimum exponent, see <a href='#minE'>minE</a>.
      </dd>
      <dd>
        As well as in decimal, a string <code>value</code> may be expressed in binary, hexadecimal
        or octal, if the appropriate prefix is included: <code>0x</code> or <code>0X</code> for
        hexadecimal, <code>0b</code> or <code>0B</code> for binary, and <code>0o</code> or
        <code>0O</code> for octal.
      </dd>
      <dd>
        Both decimal and non-decimal string values may use exponential (floating-point), as well as
        normal (fixed-point) notation.
      </dd>
      <dd>
        In exponential notation, <code>e</code> or <code>E</code> defines a power-of-ten exponent
        for decimal values, and <code>p</code> or <code>P</code> defines a power-of-two exponent for
        non-decimal values, i.e. binary, hexadecimal or octal.
      </dd>
    </dl>
    <p>Returns a new Decimal object instance.</p>
    <p>Throws on an invalid <code>value</code>.</p>
    <pre>
x = new Decimal(9)                       // '9'
y = new Decimal(x)                       // '9'

new Decimal('5032485723458348569331745.33434346346912144534543')
new Decimal('4.321e+4')                  // '43210'
new Decimal('-735.0918e-430')            // '-7.350918e-428'
new Decimal('5.6700000')                 // '5.67'
new Decimal(Infinity)                    // 'Infinity'
new Decimal(NaN)                         // 'NaN'
new Decimal('.5')                        // '0.5'
new Decimal('-0b10110100.1')             // '-180.5'
new Decimal('0xff.8')                    // '255.5'

new Decimal(0.046875)                    // '0.046875'
new Decimal('0.046875000000')            // '0.046875'

new Decimal(4.6875e-2)                   // '0.046875'
new Decimal('468.75e-4')                 // '0.046875'

new Decimal('0b0.000011')                // '0.046875'
new Decimal('0o0.03')                    // '0.046875'
new Decimal('0x0.0c')                    // '0.046875'

new Decimal('0b1.1p-5')                  // '0.046875'
new Decimal('0o1.4p-5')                  // '0.046875'
new Decimal('0x1.8p-5')                  // '0.046875'</pre>


    <h4 id="methods">Methods</h4>
    <p>The methods of a Decimal constructor.</p>


    <h5 id="Dabs">abs<code class='inset'>.abs(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#abs'>absoluteValue</a></code>.</p>
    <pre>a = Decimal.abs(x)
b = new Decimal(x).abs()
a.equals(b)                    // true</pre>


    <h5 id="Dacos">acos<code class='inset'>.acos(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#acos'>inverseCosine</a></code>.</p>
    <pre>a = Decimal.acos(x)
b = new Decimal(x).acos()
a.equals(b)                    // true</pre>


    <h5 id="Dacosh">acosh<code class='inset'>.acosh(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#acos'>inverseHyperbolicCosine</a></code>.</p>
    <pre>a = Decimal.acosh(x)
b = new Decimal(x).acosh()
a.equals(b)                    // true</pre>


    <h5 id="Dadd">add<code class='inset'>.add(x, y) <i>&rArr; Decimal</i></code></h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>y</code>: <i>number|string|Decimal</i>
    </p>
    <p>See <code><a href='#add'>plus</a></code>.</p>
    <pre>a = Decimal.add(x, y)
b = new Decimal(x).plus(y)
a.equals(b)                    // true</pre>


    <h5 id="Dasin">asin<code class='inset'>.asin(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#asin'>inverseSine</a></code>.</p>
    <pre>a = Decimal.asin(x)
b = new Decimal(x).asin()
a.equals(b)                    // true</pre>


    <h5 id="Dasinh">asinh<code class='inset'>.asinh(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#asin'>inverseHyperbolicSine</a></code>.</p>
    <pre>a = Decimal.asinh(x)
b = new Decimal(x).asinh()
a.equals(b)                    // true</pre>


    <h5 id="Datan">atan<code class='inset'>.atan(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#atan'>inverseTangent</a></code>.</p>
    <pre>a = Decimal.atan(x)
b = new Decimal(x).atan()
a.equals(b)                    // true</pre>


    <h5 id="Datanh">atanh<code class='inset'>.atanh(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#atan'>inverseHyperbolicTangent</a></code>.</p>
    <pre>a = Decimal.atanh(x)
b = new Decimal(x).atanh()
a.equals(b)                    // true</pre>


    <h5 id="Datan2">atan2<code class='inset'>.atan2(y, x) <i>&rArr; Decimal</i></code></h5>
    <p>
      <code>y</code>: <i>number|string|Decimal</i><br />
      <code>x</code>: <i>number|string|Decimal</i>
    </p>
    <p>
      Returns a new Decimal whose value is the inverse tangent in radians of the quotient of
      <code>y</code> and <code>x</code>, rounded to <a href='#precision'><code>precision</code></a>
      significant digits using rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      The signs of <code>y</code> and <code>x</code> are used to determine the quadrant of the
      result.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>-pi, pi</code>]
    </p>
    <p>
      See <a href='#Pi'><code>Pi</code></a> and
      <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atan2'><code>Math.atan2()</code>.</a>
    </p>
    <pre>r = Decimal.atan2(y, x)</pre>


    <h5 id="Dcbrt">cbrt<code class='inset'>.cbrt(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#cbrt'>cubeRoot</a></code>.</p>
    <pre>a = Decimal.cbrt(x)
b = new Decimal(x).cbrt()
a.equals(b)                    // true</pre>


    <h5 id="Dceil">ceil<code class='inset'>.ceil(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#ceil'>ceil</a></code>.</p>
    <pre>a = Decimal.ceil(x)
b = new Decimal(x).ceil()
a.equals(b)                    // true</pre>


    <h5 id="Dclone">
      clone
      <code class='inset'>.clone([object]) <i>&rArr; Decimal constructor</i></code>
    </h5>
    <p><code>object</code>: <i>object</i></p>
    <p>
      Returns a new independent Decimal constructor with configuration settings as described by
      <code>object</code> (see <a href='#Dset'><code>set</code></a>), or with the same
      settings as <code>this</code> Decimal constructor if <code>object</code> is omitted.
    </p>
    <pre>Decimal.set({ precision: 5 })
Decimal9 = Decimal.clone({ precision: 9 })

a = new Decimal(1)
b = new Decimal9(1)

a.div(3)                           // 0.33333
b.div(3)                           // 0.333333333

// Decimal9 = Decimal.clone({ precision: 9 }) is equivalent to:
Decimal9 = Decimal.clone()
Decimal9.set({ precision: 9 })</pre>
    <p>
      If <code>object</code> has a <code>'defaults'</code> property with value <code>true</code>
      then the new constructor will use the default configuration.
    </p>
    <pre>
D1 = Decimal.clone({ defaults: true })

// Use the defaults except for precision
D2 = Decimal.clone({ defaults: true, precision: 50 })</pre>
    <p>
      It is not inefficient in terms of memory usage to use multiple Decimal constructors as
      functions are shared between them.
    </p>


    <h5 id="Dcos">cos<code class='inset'>.cos(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#cos'>cosine</a></code>.</p>
    <pre>a = Decimal.cos(x)
b = new Decimal(x).cos()
a.equals(b)                    // true</pre>


    <h5 id="Dcosh">cosh<code class='inset'>.cosh(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#cos'>hyperbolicCosine</a></code>.</p>
    <pre>a = Decimal.cosh(x)
b = new Decimal(x).cosh()
a.equals(b)                    // true</pre>


    <h5 id="Ddiv">div<code class='inset'>.div(x, y) <i>&rArr; Decimal</i></code></h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>y</code>: <i>number|string|Decimal</i>
    </p>
    <p>See <code><a href='#div'>dividedBy</a></code>.</p>
    <pre>a = Decimal.div(x, y)
b = new Decimal(x).div(y)
a.equals(b)                    // true</pre>


    <h5 id="Dexp">exp<code class='inset'>.exp(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#exp'>naturalExponential</a></code>.</p>
    <pre>a = Decimal.exp(x)
b = new Decimal(x).exp()
a.equals(b)                    // true</pre>


    <h5 id="Dfloor">floor<code class='inset'>.floor(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#floor'>floor</a></code>.</p>
    <pre>a = Decimal.floor(x)
b = new Decimal(x).floor()
a.equals(b)                    // true</pre>


    <h5 id="Dhypot">
      hypot<code class='inset'>.hypot([x [, y, ...]]) <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>y</code>: <i>number|string|Decimal</i>
    </p>
    <p>
      Returns a new Decimal whose value is the square root of the sum of the squares of the
      arguments, rounded to <a href='#precision'><code>precision</code></a> significant digits using
      rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <pre>r = Decimal.hypot(x, y)</pre>


    <h5 id="Dln">ln<code class='inset'>.ln(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#ln'>naturalLogarithm</a></code>.</p>
    <pre>a = Decimal.ln(x)
b = new Decimal(x).ln()
a.equals(b)                    // true</pre>


    <h5 id="DisDecimal">
      isDecimal<code class='inset'>.isDecimal(object) <i>&rArr; boolean</i></code>
    </h5>
    <p><code>object</code>: <i>any</i></p>
    <p>
      Returns <code>true</code> if <code>object</code> is a Decimal instance (where Decimal is any
      Decimal constructor), or <code>false</code> if it is not.
    </p>
    <pre>a = new Decimal(1)
b = {}
a instanceof Decimal           // true
Decimal.isDecimal(a)           // true
Decimal.isDecimal(b)           // false</pre>


    <h5 id="Dlog">log<code class='inset'>.log(x [, base]) <i>&rArr; Decimal</i></code></h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>base</code>: <i>number|string|Decimal</i>
    </p>
    <p>See <code><a href='#log'>logarithm</a></code>.</p>
    <p>
      The default base is <code>10</code>, which is not the same as JavaScript's
      <code>Math.log()</code>, which returns the natural logarithm (base <code>e</code>).
    </p>
    <pre>a = Decimal.log(x, y)
b = new Decimal(x).log(y)
a.equals(b)                    // true</pre>


    <h5 id="Dlog2">log2<code class='inset'>.log2(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns a new Decimal whose value is the base <code>2</code> logarithm of <code>x</code>,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <pre>r = Decimal.log2(x)</pre>


    <h5 id="Dlog10">log10<code class='inset'>.log10(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns a new Decimal whose value is the base <code>10</code> logarithm of <code>x</code>,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <pre>r = Decimal.log10(x)</pre>


    <h5 id="Dmax">
      max<code class='inset'>.max([x [, y, ...]]) <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>y</code>: <i>number|string|Decimal</i>
    </p>
    <p>Returns a new Decimal whose value is the maximum of the <code>arguments</code>.</p>
    <pre>r = Decimal.max(x, y, z)</pre>


    <h5 id="Dmin">
      min<code class='inset'>.min([x [, y, ...]]) <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>y</code>: <i>number|string|Decimal</i>
    </p>
    <p>Returns a new Decimal whose value is the minimum of the <code>arguments</code>.</p>
    <pre>r = Decimal.min(x, y, z)</pre>


    <h5 id="Dmod">mod<code class='inset'>.mod(x, y) <i>&rArr; Decimal</i></code></h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>y</code>: <i>number|string|Decimal</i>
    </p>
    <p>See <code><a href='#mod'>modulo</a></code>.</p>
    <pre>a = Decimal.mod(x, y)
b = new Decimal(x).mod(y)
a.equals(b)                    // true</pre>


    <h5 id="Dmul">mul<code class='inset'>.mul(x, y) <i>&rArr; Decimal</i></code></h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>y</code>: <i>number|string|Decimal</i>
    </p>
    <p>See <code><a href='#mul'>times</a></code>.</p>
    <pre>a = Decimal.mul(x, y)
b = new Decimal(x).mul(y)
a.equals(b)                    // true</pre>


    <h5 id="DnoConflict">
      noConflict<code class='inset'>.noConflict() <i>&rArr; Decimal constructor</i></code>
    </h5>
    <p><i>Browsers only.</i></p>
    <p>
      Reverts the <code>Decimal</code> variable to the value it had before this library was loaded
      and returns a reference to the original Decimal constructor so it can be assigned to a
      variable with a different name.
    </p>
    <pre>
&lt;script&gt; Decimal = 1 &lt;/script&gt;
&lt;script src='/path/to/decimal.js'&gt;&lt;/script&gt;
&lt;script&gt;
  a = new Decimal(2)      // '2'
  D = Decimal.noConflict()
  Decimal                 // 1
  b = new D(3)            // '3'
&lt;/script&gt;</pre>


    <h5 id="Dpow">pow<code class='inset'>.pow(base, exponent) <i>&rArr; Decimal</i></code></h5>
    <p>
      <code>base</code>: <i>number|string|Decimal</i><br />
      <code>exponent</code>: <i>number|string|Decimal</i>
    </p>
    <p>See <code><a href="#pow">toPower</a></code>.</p>
    <pre>a = Decimal.pow(x, y)
b = new Decimal(x).pow(y)
a.equals(b)                    // true</pre>


    <h5 id="Drandom">
      random<code class='inset'>.random([dp]) <i>&rArr; Decimal</i></code>
    </h5>
    <p><code>dp</code>: <i>number</i>: integer, <code>0</code> to <code>1e+9</code> inclusive</p>
    <p>
      Returns a new Decimal with a pseudo-random value equal to or greater than <code>0</code> and
      less than <code>1</code>.
    </p>
    <p>
      The return value will have <code>dp</code> decimal places (or less if trailing zeros are
      produced). If <code>dp</code> is omitted then the number of decimal places will
      default to the current <a href='#precision'><code>precision</code></a> setting.
    </p>
    <p>
      If the value of <code>this</code> Decimal constructor's
      <a href='#crypto'><code>crypto</code></a> property is <code>true</code>, and the
      <code>crypto</code> object is available globally in the host environment, the random digits of
      the return value are generated by either <code>crypto.getRandomValues</code> (Web Cryptography
      API in modern browsers) or <code>crypto.randomBytes</code> (Node.js), otherwise, if the the
      value of the property is <code>false</code> the return value is generated by
      <code>Math.random</code> (fastest).
    </p>
    <p>To make the <code>crypto</code> object available globally in Node.js use</p>
    <pre>global.crypto = require('crypto')</pre>
    <p>
      If the value of <code>this</code> Decimal constructor's
      <a href='#crypto'><code>crypto</code></a> property is set <code>true</code> and the
      <code>crypto</code> object and associated method are not available, an exception will be
      thrown.
    </p>
    <p>
      If one of the <code>crypto</code> methods is used, the value of the returned Decimal should be
      cryptographically-secure and statistically indistinguishable from a random value.
    </p>
    <pre>Decimal.set({ precision: 10 })
Decimal.random()                    // '0.4117936847'
Decimal.random(20)                  // '0.78193327636914089009'</pre>


    <h5 id="Dround">round<code class='inset'>.round(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#round'>round</a></code>.</p>
    <pre>a = Decimal.round(x)
b = new Decimal(x).round()
a.equals(b)                    // true</pre>


    <h5 id="Dset">set<code class='inset'>.set(object) <i>&rArr; Decimal constructor</i></code></h5>
    <p><code>object</code>: <i>object</i></p>
    <p>
      Configures the 'global' settings for <code>this</code> particular Decimal constructor, i.e.
      the settings which apply to operations performed on the Decimal instances created by it.
    </p>
    <p>Returns <code>this</code> Decimal constructor.</p>
    <p>
      The configuration object, <code>object</code>, can contain some or all of the properties
      described in detail at <a href="#constructor-properties">Properties</a> and shown in the
      example below.
    </p>
    <p>
      The values of the configuration object properties are checked for validity and then stored as
      equivalently-named properties of <code>this</code> Decimal constructor.
    </p>
    <p>
      If <code>object</code> has a <code>'defaults'</code> property with value <code>true</code>
      then any unspecified properties will be reset to their default values.
    </p>
    <p>Throws on an invalid <code>object</code> or configuration property value.</p>
    <pre>
// Defaults
Decimal.set({
    precision: 20,
    rounding: 4,
    toExpNeg: -7,
    toExpPos: 21,
    maxE: 9e15,
    minE: -9e15,
    modulo: 1,
    crypto: false
})

// Reset all properties to their default values
Decimal.set({ defaults: true })

// Set precision to 50 and all other properties to their default values
Decimal.set({ precision: 50, defaults: true })</pre>
    <p>
      The properties of a Decimal constructor can also be set by direct assignment, but that will
      by-pass the validity checking that this method performs - this is not a problem if the user
      knows that the assignment is valid.
    </p>
    <pre>Decimal.precision = 40</pre>


    <h5 id="Dsign">sign<code class='inset'>.sign(x) <i>&rArr; number</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <table>
      <tr><th>Returns</th><th>&nbsp;</th></tr>
      <tr>
        <td class='centre'><code>1</code></td>
        <td>if the value of <code>x</code> is non-zero and its sign is positive</td>
      </tr>
      <tr>
        <td class='centre'><code>-1</code></td>
        <td>if the value of <code>x</code> is non-zero and its sign is negative</td>
      </tr>
      <tr>
        <td class='centre'><code>0</code></td>
        <td>if the value of <code>x</code> is positive zero</td>
      </tr>
      <tr>
        <td class='centre'><code>-0</code></td>
        <td>if the value of <code>x</code> is negative zero</td>
      </tr>
      <tr>
        <td class='centre'><code>NaN</code></td>
        <td>if the value of <code>x</code> is <code>NaN</code></td>
      </tr>
    </table>
    <pre>r = Decimal.sign(x)</pre>


    <h5 id="Dsin">sin<code class='inset'>.sin(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#sin'>sine</a></code>.</p>
    <pre>a = Decimal.sin(x)
b = new Decimal(x).sin()
a.equals(b)                    // true</pre>


    <h5 id="Dsinh">sinh<code class='inset'>.sinh(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#sin'>hyperbolicSine</a></code>.</p>
    <pre>a = Decimal.sinh(x)
b = new Decimal(x).sinh()
a.equals(b)                    // true</pre>


    <h5 id="Dsqrt">sqrt<code class='inset'>.sqrt(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <a href='#sqrt'>squareRoot</a>.</p>
    <pre>a = Decimal.sqrt(x)
b = new Decimal(x).sqrt()
a.equals(b)                    // true</pre>


      <h5 id="Dsub">sub<code class='inset'>.sub(x, y) <i>&rArr; Decimal</i></code></h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>y</code>: <i>number|string|Decimal</i>
    </p>
    <p>See <code><a href='#sub'>minus</a></code>.</p>
    <pre>a = Decimal.sub(x, y)
b = new Decimal(x).sub(y)
a.equals(b)                    // true</pre>


     <h5 id="Dtan">tan<code class='inset'>.tan(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#tan'>tangent</a></code>.</p>
    <pre>a = Decimal.tan(x)
b = new Decimal(x).tan()
a.equals(b)                    // true</pre>


    <h5 id="Dtanh">tanh<code class='inset'>.tanh(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#tan'>hyperbolicTangent</a></code>.</p>
    <pre>a = Decimal.tanh(x)
b = new Decimal(x).tanh()
a.equals(b)                    // true</pre>


    <h5 id="Dtrunc">trunc<code class='inset'>.trunc(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>See <code><a href='#trunc'>truncated</a></code>.</p>
    <pre>a = Decimal.trunc(x)
b = new Decimal(x).trunc()
a.equals(b)                    // true</pre>


    <h4 id="constructor-properties">Properties</h4>
    <p>The properties of a Decimal constructor.</p>


    <h6 id='configProps'>Configuration properties</h6>
    <p>
      The values of the configuration properties <a href='#precision'><code>precision</code></a>,
      <a href='#rounding'><code>rounding</code></a>, <a href='#minE'><code>minE</code></a>,
      <a href='#maxE'><code>maxE</code></a>, <a href='#toExpNeg'><code>toExpNeg</code></a>,
      <a href='#toExpPos'><code>toExpPos</code></a>, <a href='#modulo'><code>modulo</code></a>, and
      <a href='#crypto'><code>crypto</code></a> are set using the
      <a href='#Dset'><code>set</code></a> method.
    </p>
    <p>
      As simple object properties they can be set directly without using
      <a href='#Dset'><code>set</code></a>, and it is fine to do so, but the values assigned
      will not then be checked for validity. For example:
    </p>
    <pre>Decimal.set({ precision: 0 })
// '[DecimalError] Invalid argument: precision: 0'

Decimal.precision = 0
// No error is thrown and the results of calculations are unreliable</pre>


    <h5 id="precision">precision</h5>
    <p>
      <i>number</i>: integer, <code>1</code> to <code>1e+9</code> inclusive<br />
      Default value: <code>20</code>
    </p>
    <p>The <i>maximum</i> number of significant digits of the result of an operation.</p>
    <p>
      All functions which return a Decimal will round the return value to <code>precision</code>
      significant digits except <a href='#decimal'><code>Decimal</code></a>,
      <a href='#abs'><code>absoluteValue</code></a>,
      <a href='#ceil'><code>ceil</code></a>, <a href='#floor'><code>floor</code></a>,
      <a href='#neg'><code>negated</code></a>, <a href='#round'><code>round</code></a>,
      <a href='#toDP'><code>toDecimalPlaces</code></a>,
      <a href='#toNearest'><code>toNearest</code></a> and
      <a href='#trunc'><code>truncated</code></a>.
    </p>
    <p>
      See <code><a href='#Pi'>Pi</a></code> for the precision limit of the trigonometric methods.
    </p>
    <pre>Decimal.set({ precision: 5 })
Decimal.precision                  // 5</pre>


    <h5 id="rounding">rounding</h5>
    <p>
      <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive<br />
      Default value: <code>4</code> <a href="#modes">(<code>ROUND_HALF_UP</code>)</a>
    </p>
    <p>
      The default rounding mode used when rounding the result of an operation to
      <code><a href='#precision'>precision</a></code> significant digits, and when rounding the
      return value of the <a href='#round'><code>round</code></a>,
      <a href='#toBinary'><code>toBinary</code></a>,
      <a href='#toDP'><code>toDecimalPlaces</code></a>,
      <a href='#toExponential'><code>toExponential</code></a>,
      <a href='#toFixed'><code>toFixed</code></a>,
      <a href='#toHexadecimal'><code>toHexadecimal</code></a>,
      <a href='#toNearest'><code>toNearest</code></a>,
      <a href='#toOctal'><code>toOctal</code></a>,
      <a href='#toPrecision'><code>toPrecision</code></a> and
      <a href='#toSD'><code>toSignificantDigits</code></a> methods.
    </p>
    <p>
      The <a href='#modes'>rounding modes</a> are available as enumerated properties of the
      constructor.
    </p>
    <pre>Decimal.set({ rounding: Decimal.ROUND_UP })
Decimal.set({ rounding: 0 })       // equivalent
Decimal.rounding                   // 0</pre>


    <h5 id="minE">minE</h5>
    <p>
      <i>number</i>: integer, <code>-9e15</code> to <code>0</code> inclusive<br />
      Default value: <code>-9e15</code>
    </p>
    <p>
      The negative exponent limit, i.e. the exponent value below which underflow to zero occurs.
    </p>
    <p>
      If the <code>Decimal</code> to be returned by a calculation would have an exponent lower than
      <code>minE</code> then the value of that <code>Decimal</code> becomes zero.
    <p>
      JavaScript numbers underflow to zero for exponents below <code>-324</code>.
    </p>
    <pre>Decimal.set({ minE: -500 })
Decimal.minE                       // -500
new Decimal('1e-500')              // '1e-500'
new Decimal('9.9e-501')            // '0'

Decimal.set({ minE: -3 })
new Decimal(0.001)                 // '0.01'       e is -3
new Decimal(0.0001)                // '0'          e is -4</pre>
    <p>
      The smallest possible magnitude of a non-zero Decimal is <code>1e-9000000000000000</code>
    </p>


    <h5 id="maxE">maxE</h5>
    <p>
      <i>number</i>: integer, <code>0</code> to <code>9e15</code> inclusive<br />
      Default value: <code>9e15</code>
    </p>
    <p>
      The positive exponent limit, i.e. the exponent value above which overflow to
      <code>Infinity</code> occurs.
    </p>
    <p>
      If the <code>Decimal</code> to be returned by a calculation would have an exponent higher than
      <code>maxE</code> then the value of that <code>Decimal</code> becomes <code>Infinity</code>.
    <p>
      JavaScript numbers overflow to <code>Infinity</code> for exponents above <code>308</code>.
    </p>
    <pre>Decimal.set({ maxE: 500 })
Decimal.maxE                       // 500
new Decimal('9.999e500')           // '9.999e+500'
new Decimal('1e501')               // 'Infinity'

Decimal.set({ maxE: 4 })
new Decimal(99999)                 // '99999'      e is 4
new Decimal(100000)                // 'Infinity'</pre>
    <p>
      The largest possible magnitude of a finite Decimal is <code>9.999...e+9000000000000000</code>
    </p>


    <h5 id="toExpNeg">toExpNeg</h5>
    <p>
      <i>number</i>: integer, <code>-9e15</code> to <code>0</code> inclusive<br />
      Default value: <code>-7</code>
    </p>
    <p>
      The negative exponent value at and below which <a href='#toString'><code>toString</code></a>
      returns exponential notation.
    </p>
    <pre>Decimal.set({ toExpNeg: -7 })
Decimal.toExpNeg                   // -7
new Decimal(0.00000123)            // '0.00000123'       e is -6
new Decimal(0.000000123)           // '1.23e-7'

// Always return exponential notation:
Decimal.set({ toExpNeg: 0 })</pre>
    <p>
      JavaScript numbers use exponential notation for negative exponents of <code>-7</code> and
      below.
    </p>
    <p>
      Regardless of the value of <code>toExpNeg</code>, the
      <a href='#toFixed'><code>toFixed</code></a> method will always return a value in normal
      notation and the <a href='#toExponential'><code>toExponential</code></a> method will always
      return a value in exponential form.
    </p>


    <h5 id="toExpPos">toExpPos</h5>
    <p>
      <i>number</i>: integer, <code>0</code> to <code>9e15</code> inclusive<br />
      Default value: <code>20</code>
    </p>
    <p>
      The positive exponent value at and above which <a href='#toString'><code>toString</code></a>
      returns exponential notation.
    </p>
    <pre>Decimal.set({ toExpPos: 2 })
Decimal.toExpPos                   // 2
new Decimal(12.3)                  // '12.3'        e is 1
new Decimal(123)                   // '1.23e+2'

// Always return exponential notation:
Decimal.set({ toExpPos: 0 })</pre>
    <p>
      JavaScript numbers use exponential notation for positive exponents of <code>20</code> and
      above.
    </p>
    <p>
      Regardless of the value of <code>toExpPos</code>, the
      <a href='#toFixed'><code>toFixed</code></a> method will always return a value in normal
      notation and the <a href='#toExponential'><code>toExponential</code></a> method will always
      return a value in exponential form.
    </p>


    <h5 id="modulo">modulo</h5>
    <p>
      <i>number</i>: integer, <code>0</code> to <code>9</code> inclusive<br />
      Default value: <code>1</code> (<code>ROUND_DOWN</code>)
    </p>
    <p>The modulo mode used when calculating the modulus: <code>a mod n</code>.</p>
    <p>
      The quotient, <code>q = a / n</code>, is calculated according to the
      <a href='#rounding'><code>rounding</code></a> mode that corresponds to the chosen
      <code>modulo</code> mode.
    </p>
    <p>The remainder, <code>r</code>, is calculated as: <code>r = a - n * q</code>.</p>
    <p>
      The modes that are most commonly used for the modulus/remainder operation are shown in the
      following table. Although the other <a href='#rounding'><code>rounding</code></a> modes can
      be used, they may not give useful results.
    </p>
    <table>
      <tr><th>Property</th><th>Value</th><th>Description</th></tr>
      <tr>
        <td>ROUND_UP</td><td class='centre'>0</td>
        <td>The remainder is positive if the dividend is negative, else is negative</td>
      </tr>
      <tr>
        <td>ROUND_DOWN</td><td class='centre'>1</td>
        <td>
          The remainder has the same sign as the dividend.<br />
          This uses truncating division and matches the behaviour of JavaScript's remainder
          operator <code>%</code>.
        </td>
      </tr>
      <tr>
        <td>ROUND_FLOOR</td><td class='centre'>3</td>
        <td>
          The remainder has the same sign as the divisor.<br />
          (This matches Python's <code>%</code> operator)
        </td>
      </tr>
      <tr>
        <td>ROUND_HALF_EVEN</td><td class='centre'>6</td>
        <td>The <i>IEEE 754</i> remainder function</td>
      </tr>
       <tr>
         <td>EUCLID</td><td class='centre'>9</td>
         <td>
           The remainder is always positive.<br />
           Euclidian division: <code>q = sign(x) * floor(a / abs(x))</code>.
         </td>
       </tr>
    </table>
    <p>
      The rounding/modulo modes are available as enumerated properties of the Decimal constructor.
    </p>
    <pre>Decimal.set({ modulo: Decimal.EUCLID })
Decimal.set({ modulo: 9 })         // equivalent
Decimal.modulo                     // 9</pre>


    <h5 id="crypto">crypto</h5>
    <p>
      <i>boolean</i>: <code>true/false</code><br /> Default value: <code>false</code>
    </p>
    <p>
      The value that determines whether cryptographically-secure pseudo-random number generation is
      used.
    </p>
    <p>See <a href='#Drandom'><code>random</code></a>.</p>
    <pre>
// Node.js
global.crypto = require('crypto')

Decimal.crypto                     // false
Decimal.set({ crypto: true })
Decimal.crypto                     // true</pre>


    <h6 id="modes">Rounding modes</h6>
    <p>
      The library's enumerated rounding modes are stored as properties of the Decimal constructor.
      <br />They are not referenced internally by the library itself.
    </p>
    <p>Rounding modes 0 to 6 (inclusive) are the same as those of Java's BigDecimal class.</p>
    <table>
      <tr><th>Property</th><th>Value</th><th>Description</th></tr>
      <tr><td><b>ROUND_UP</b></td><td class='centre'>0</td><td>Rounds away from zero</td></tr>
      <tr><td><b>ROUND_DOWN</b></td><td class='centre'>1</td><td>Rounds towards zero</td></tr>
      <tr><td><b>ROUND_CEIL</b></td><td class='centre'>2</td><td>Rounds towards Infinity</td></tr>
      <tr><td><b>ROUND_FLOOR</b></td><td class='centre'>3</td><td>Rounds towards -Infinity</td></tr>
      <tr>
        <td><b>ROUND_HALF_UP</b></td><td class='centre'>4</td>
        <td>Rounds towards nearest neighbour.<br />If equidistant, rounds away from zero</td>
      </tr>
      <tr>
        <td><b>ROUND_HALF_DOWN</b></td><td class='centre'>5</td>
        <td>Rounds towards nearest neighbour.<br />If equidistant, rounds towards zero</td>
      </tr>
      <tr>
        <td><b>ROUND_HALF_EVEN</b></td><td class='centre'>6</td>
        <td>
          Rounds towards nearest neighbour.<br />If equidistant, rounds towards even neighbour
        </td>
      </tr>
      <tr>
        <td><b>ROUND_HALF_CEIL</b></td><td class='centre'>7</td>
        <td>Rounds towards nearest neighbour.<br />If equidistant, rounds towards Infinity</td>
      </tr>
      <tr>
        <td><b>ROUND_HALF_FLOOR</b></td><td class='centre'>8</td>
        <td>Rounds towards nearest neighbour.<br />If equidistant, rounds towards -Infinity</td>
      </tr>
       <tr>
         <td><b>EUCLID</b></td><td class='centre'>9</td>
         <td>Not a rounding mode, see <a href='#modulo'>modulo</a></td>
       </tr>
    </table>
    <pre>Decimal.set({ rounding: Decimal.ROUND_CEIL })
Decimal.set({ rounding: 2 })       // equivalent
Decimal.rounding                   // 2</pre>


    <h3>INSTANCE</h3>

    <h4 id="prototype-methods">Methods</h4>
    <p>The methods inherited by a Decimal instance from its constructor's prototype object.</p>
    <p>A Decimal instance is immutable in the sense that it is not changed by its methods.</p>
    <p>Methods that return a Decimal can be chained:</p>
    <pre>x = new Decimal(2).times('999.999999999999999').dividedBy(4).ceil()</pre>
    <p>Methods do not round their arguments before execution.</p>
    <p>
      The treatment of <code>&plusmn;0</code>, <code>&plusmn;Infinity</code> and <code>NaN</code>
      is consistent with how JavaScript treats these values.
    </p>
    <p>
      Many method names have a shorter alias. (Internally, the library always uses the shorter
      method names.)
    </p>


    <h5 id="abs">absoluteValue<code class='inset'>.abs() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the absolute value, i.e. the magnitude, of the value of
      this Decimal.
    </p>
    <p>
      The return value is not affected by the value of the
      <a href='#precision'><code>precision</code></a> setting.
    </p>
    <pre>
x = new Decimal(-0.8)
y = x.absoluteValue()         // '0.8'
z = y.abs()                   // '0.8'</pre>


    <h5 id="ceil">ceil<code class='inset'>.ceil() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the value of this Decimal rounded to a whole number in
      the direction of positive <code>Infinity</code>.
    </p>
    <p>
      The return value is not affected by the value of the
      <a href='#precision'><code>precision</code></a> setting.
    </p>
    <pre>
x = new Decimal(1.3)
x.ceil()                      // '2'
y = new Decimal(-1.8)
y.ceil()                      // '-1'</pre>


    <h5 id="cmp">comparedTo<code class='inset'>.cmp(x) <i>&rArr; number</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <table>
      <tr><th>Returns</th><th>&nbsp;</th></tr>
      <tr>
        <td class='centre'><code>1</code></td>
        <td>if the value of this Decimal is greater than the value of <code>x</code></td>
      </tr>
      <tr>
        <td class='centre'><code>-1</code></td>
        <td>if the value of this Decimal is less than the value of <code>x</code></td>
      </tr>
      <tr>
        <td class='centre'><code>0</code></td>
        <td>if this Decimal and <code>x</code> have the same value</td>
      </tr>
      <tr>
        <td class='centre'><code>NaN</code></td>
        <td>if the value of either this Decimal or <code>x</code> is <code>NaN</code> </td>
      </tr>
    </table>
    <pre>
x = new Decimal(Infinity)
y = new Decimal(5)
x.comparedTo(y)                // 1
x.comparedTo(x.minus(1))       // 0
y.cmp(NaN)                     // NaN</pre>


    <h5 id="cos">cosine<code class='inset'>.cos() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the cosine of the value in radians of this Decimal,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>-1, 1</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(0.25)
x.cosine()                      // '0.96891242171064478414'
y = new Decimal(-0.25)
y.cos()                         // '0.96891242171064478414'</pre>


    <h5 id="cbrt">cubeRoot<code class='inset'>.cbrt() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the cube root of this Decimal, rounded to
      <a href='#precision'><code>precision</code></a> significant digits using rounding mode
      <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      The return value will be correctly rounded, i.e. rounded as if the result was first calculated
      to an infinite number of correct digits before rounding.
    </p>
    <pre>
x = new Decimal(125)
x.cubeRoot()                    // '5'
y = new Decimal(3)
y.cbrt()                        // '1.4422495703074083823'</pre>


    <h5 id="dp">decimalPlaces<code class='inset'>.dp() <i>&rArr; number</i></code></h5>
    <p>
      Returns the number of decimal places, i.e. the number of digits after the decimal point, of
      the value of this Decimal.
    </p>
    <pre>
x = new Decimal(1.234)
x.decimalPlaces()              // '3'
y = new Decimal(987.654321)
y.dp()                         // '6'</pre>


    <h5 id="div">dividedBy<code class='inset'>.div(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns a new Decimal whose value is the value of this Decimal divided by <code>x</code>,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <pre>
x = new Decimal(355)
y = new Decimal(113)
x.dividedBy(y)             // '3.14159292035398230088'
x.div(5)                   // '71'</pre>


    <h5 id="divToInt">
      dividedToIntegerBy<code class='inset'>.divToInt(x) <i>&rArr; Decimal</i></code>
    </h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Return a new Decimal whose value is the integer part of dividing this Decimal by
      <code>x</code>, rounded to <code><a href='#precision'>precision</a></code> significant digits
      using rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <pre>
x = new Decimal(5)
y = new Decimal(3)
x.dividedToIntegerBy(y)     // '1'
x.divToInt(0.7)             // '7'</pre>


    <h5 id="eq">equals<code class='inset'>.eq(x) <i>&rArr; boolean</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns <code>true</code> if the value of this Decimal equals the value of <code>x</code>,
      otherwise returns <code>false</code>.<br /> As with JavaScript, <code>NaN</code> does not
      equal <code>NaN</code>.
    </p>
    <p>Note: This method uses the <code>cmp</code> method internally.</p>
    <pre>
0 === 1e-324                     // true
x = new Decimal(0)
x.equals('1e-324')               // false
new Decimal(-0).eq(x)            // true  ( -0 === 0 )

y = new Decimal(NaN)
y.equals(NaN)                    // false</pre>


    <h5 id="floor">floor<code class='inset'>.floor() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the value of this Decimal rounded to a whole number in
      the direction of negative <code>Infinity</code>.
    </p>
    <p>
      The return value is not affected by the value of the
      <a href='#precision'><code>precision</code></a> setting.
    </p>
    <pre>
x = new Decimal(1.8)
x.floor()                   // '1'
y = new Decimal(-1.3)
y.floor()                   // '-2'</pre>


    <h5 id="gt">greaterThan<code class='inset'>.gt(x) <i>&rArr; boolean</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns <code>true</code> if the value of this Decimal is greater than the value of
      <code>x</code>, otherwise returns <code>false</code>.
    </p>
    <p>Note: This method uses the <code>cmp</code> method internally.</p>
    <pre>
0.1 &gt; (0.3 - 0.2)                            // true
x = new Decimal(0.1)
x.greaterThan(Decimal(0.3).minus(0.2))       // false
new Decimal(0).gt(x)                         // false</pre>


    <h5 id="gte">
      greaterThanOrEqualTo<code class='inset'>.gte(x) <i>&rArr; boolean</i></code>
    </h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns <code>true</code> if the value of this Decimal is greater than or equal to the value
      of <code>x</code>, otherwise returns <code>false</code>.
    </p>
    <p>Note: This method uses the <code>cmp</code> method internally.</p>
    <pre>
(0.3 - 0.2) &gt;= 0.1                       // false
x = new Decimal(0.3).minus(0.2)
x.greaterThanOrEqualTo(0.1)              // true
new Decimal(1).gte(x)                    // true</pre>


    <h5 id="cosh">hyperbolicCosine<code class='inset'>.cosh() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the hyperbolic cosine of the value in radians of this
      Decimal, rounded to <a href='#precision'><code>precision</code></a> significant digits using
      rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>1, Infinity</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(1)
x.hyperbolicCosine()                     // '1.5430806348152437785'
y = new Decimal(0.5)
y.cosh()                                 // '1.1276259652063807852'</pre>


    <h5 id="sinh">hyperbolicSine<code class='inset'>.sinh() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the hyperbolic sine of the value in radians of this
      Decimal, rounded to <a href='#precision'><code>precision</code></a> significant digits using
      rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>-Infinity, Infinity</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(1)
x.hyperbolicSine()                       // '1.1752011936438014569'
y = new Decimal(0.5)
y.sinh()                                 // '0.52109530549374736162'</pre>


    <h5 id="tanh">hyperbolicTangent<code class='inset'>.tanh() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the hyperbolic tangent of the value in radians of this
      Decimal, rounded to <a href='#precision'><code>precision</code></a> significant digits using
      rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>-1, 1</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(1)
x.hyperbolicTangent()                    // '0.76159415595576488812'
y = new Decimal(0.5)
y.tanh()                                 // '0.4621171572600097585'</pre>


    <h5 id="acos">inverseCosine<code class='inset'>.acos() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the inverse cosine in radians of the value of this
      Decimal, rounded to <a href='#precision'><code>precision</code></a> significant digits using
      rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-1, 1</code>]<br />
      Range: [<code>0, pi</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(0)
x.inverseCosine()                        // '1.5707963267948966192'
y = new Decimal(0.5)
y.acos()                                 // '1.0471975511965977462'</pre>


    <h5 id="acosh">
      inverseHyperbolicCosine<code class='inset'>.acosh() <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      Returns a new Decimal whose value is the inverse hyperbolic cosine in radians of the value of
      this Decimal, rounded to <a href='#precision'><code>precision</code></a> significant
      digits using rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>1, Infinity</code>]<br />
      Range: [<code>0, Infinity</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(5)
x.inverseHyperbolicCosine()              // '2.2924316695611776878'
y = new Decimal(50)
y.acosh()                                // '4.6050701709847571595'</pre>


    <h5 id="asinh">
      inverseHyperbolicSine<code class='inset'>.asinh() <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      Returns a new Decimal whose value is the inverse hyperbolic sine in radians of the value of
      this Decimal, rounded to <a href='#precision'><code>precision</code></a> significant digits
      using rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>-Infinity, Infinity</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(5)
x.inverseHyperbolicSine()                // '2.3124383412727526203'
y = new Decimal(50)
y.asinh()                                // '4.6052701709914238266'</pre>


    <h5 id="atanh">
      inverseHyperbolicTangent<code class='inset'>.atanh() <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      Returns a new Decimal whose value is the inverse hyperbolic tangent in radians of the value of
      this Decimal, rounded to <a href='#precision'><code>precision</code></a> significant
      digits using rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-1, 1</code>]<br />
      Range: [<code>-Infinity, Infinity</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(0.5)
x.inverseHyperbolicTangent()             // '0.5493061443340548457'
y = new Decimal(0.75)
y.atanh()                                // '0.97295507452765665255'</pre>


    <h5 id="asin">inverseSine<code class='inset'>.asin() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the inverse sine in radians of the value of this Decimal,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-1, 1</code>]<br />
      Range: [<code>-pi/2, pi/2</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(0.5)
x.inverseSine()                          // '0.52359877559829887308'
y = new Decimal(0.75)
y.asin()                                 // '0.84806207898148100805'</pre>


    <h5 id="atan">inverseTangent<code class='inset'>.atan() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the inverse tangent in radians of the value of this
      Decimal, rounded to <a href='#precision'><code>precision</code></a> significant digits using
      rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>-pi/2, pi/2</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(0.5)
x.inverseTangent()                       // '0.46364760900080611621'
y = new Decimal(0.75)
y.atan()                                 // '0.6435011087932843868'</pre>


    <h5 id="isFinite">isFinite<code class='inset'>.isFinite() <i>&rArr; boolean</i></code></h5>
    <p>
      Returns <code>true</code> if the value of this Decimal is a finite number, otherwise returns
      <code>false</code>.<br />
      The only possible non-finite values of a Decimal are <code>NaN</code>, <code>Infinity</code>
      and <code>-Infinity</code>.
    </p>
    <pre>
x = new Decimal(1)
x.isFinite()                             // true
y = new Decimal(Infinity)
y.isFinite()                             // false</pre>
    <p>
      Note: The native method <code>isFinite()</code> can be used if
      <code>n &lt;= Number.MAX_VALUE</code>.
    </p>


    <h5 id="isInt">isInteger<code class='inset'>.isInt() <i>&rArr; boolean</i></code></h5>
    <p>
      Returns <code>true</code> if the value of this Decimal is a whole number, otherwise returns
      <code>false</code>.
    </p>
    <pre>
x = new Decimal(1)
x.isInteger()                            // true
y = new Decimal(123.456)
y.isInt()                                // false</pre>


    <h5 id="isNaN">isNaN<code class='inset'>.isNaN() <i>&rArr; boolean</i></code></h5>
    <p>
      Returns <code>true</code> if the value of this Decimal is <code>NaN</code>, otherwise returns
      <code>false</code>.
    </p>
    <pre>
x = new Decimal(NaN)
x.isNaN()                                // true
y = new Decimal('Infinity')
y.isNaN()                                // false</pre>
    <p>Note: The native method <code>isNaN()</code> can also be used.</p>


    <h5 id="isNeg">isNegative<code class='inset'>.isNeg() <i>&rArr; boolean</i></code></h5>
    <p>
      Returns <code>true</code> if the value of this Decimal is negative, otherwise returns
      <code>false</code>.
    </p>
    <pre>
x = new Decimal(-0)
x.isNegative()                           // true
y = new Decimal(2)
y.isNeg                                  // false</pre>
    <p>Note: <code>n &lt; 0</code> can be used if <code>n &lt;= -Number.MIN_VALUE</code>.</p>

    <p>Also note that signed zeroes are implemented, following the IEEE Standard
      for Floating-Point Arithmetic (IEEE 754).</p>

    <pre>
Decimal(0).valueOf()                 // '0'
Decimal(0).isNegative()              // false
Decimal(0).negated().valueOf()       // '-0'
Decimal(0).negated().isNegative()    // true
    </pre>

     <h5 id="isPos">isPositive<code class='inset'>.isPos() <i>&rArr; boolean</i></code></h5>
    <p>
      Returns <code>true</code> if the value of this Decimal is positive, otherwise returns
      <code>false</code>.
    </p>
    <pre>
x = new Decimal(0)
x.isPositive()                           // true
y = new Decimal(-2)
y.isPos                                  // false</pre>
    <p>Note: <code>n &lt; 0</code> can be used if <code>n &lt;= -Number.MIN_VALUE</code>.</p>


    <h5 id="isZero">isZero<code class='inset'>.isZero() <i>&rArr; boolean</i></code></h5>
    <p>
      Returns <code>true</code> if the value of this Decimal is zero or minus zero, otherwise
      returns <code>false</code>.
    </p>
    <pre>
x = new Decimal(-0)
x.isZero() && x.isNeg()                  // true
y = new Decimal(Infinity)
y.isZero()                               // false</pre>
    <p>Note: <code>n == 0</code> can be used if <code>n &gt;= Number.MIN_VALUE</code>.</p>


    <h5 id="lt">lessThan<code class='inset'>.lt(x) <i>&rArr; boolean</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns <code>true</code> if the value of this Decimal is less than the value of
      <code>x</code>, otherwise returns <code>false</code>.
    </p>
    <p>Note: This method uses the <code>cmp</code> method internally.</p>
    <pre>
(0.3 - 0.2) &lt; 0.1                        // true
x = new Decimal(0.3).minus(0.2)
x.lessThan(0.1)                          // false
new Decimal(0).lt(x)                     // true</pre>


    <h5 id="lte">lessThanOrEqualTo<code class='inset'>.lte(x) <i>&rArr; boolean</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns <code>true</code> if the value of this Decimal is less than or equal to the value of
      <code>x</code>, otherwise returns <code>false</code>.
    </p>
    <p>Note: This method uses the <code>cmp</code> method internally.</p>
    <pre>
0.1 &lt;= (0.3 - 0.2)                              // false
x = new Decimal(0.1)
x.lessThanOrEqualTo(Decimal(0.3).minus(0.2))    // true
new Decimal(-1).lte(x)                          // true</pre>


    <h5 id="log">logarithm<code class='inset'>.log(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns a new Decimal whose value is the base <code>x</code> logarithm of the value of this
      Decimal, rounded to <a href='#precision'><code>precision</code></a> significant digits using
      rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      If <code>x</code> is omitted, the base 10 logarithm of the value of this Decimal will be
      returned.
    </p>
    <pre>
x = new Decimal(1000)
x.logarithm()                            // '3'
y = new Decimal(256)
y.log(2)                                 // '8'</pre>
    <p>
      The return value will <i>almost always</i> be correctly rounded, i.e. rounded as if the result
      was first calculated to an infinite number of correct digits before rounding. If a result is
      incorrectly rounded the maximum error will be <code>1</code> <i>ulp</i> (unit in the last
      place).
    </p>
    <p>Logarithms to base <code>2</code> or <code>10</code> will always be correctly rounded.</p>
    <p>
      See <a href='#pow'><code>toPower</code></a> for the circumstances in which this method may
      return an incorrectly rounded result, and see <a href='#ln'><code>naturalLogarithm</code></a>
      for the precision limit.
    </p>
    <p>The performance of this method degrades exponentially with increasing digits.</p>


    <h5 id="sub">minus<code class='inset'>.minus(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns a new Decimal whose value is the value of this Decimal minus <code>x</code>, rounded
      to <a href='#precision'><code>precision</code></a> significant digits using rounding mode
      <a href='#rounding'><code>rounding</code></a>.
    </p>
    <pre>
0.3 - 0.1                                // 0.19999999999999998
x = new Decimal(0.3)
x.minus(0.1)                             // '0.2'</pre>


    <h5 id="mod">modulo<code class='inset'>.mod(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns a new Decimal whose value is the value of this Decimal modulo <code>x</code>,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      The value returned, and in particular its sign, is dependent on the value of the
      <a href='#modulo'><code>modulo</code></a> property of this Decimal's constructor. If it is
      <code>1</code> (default value), the result will have the same sign as this Decimal, and it
      will match that of Javascript's <code>%</code> operator (within the limits of double
      precision) and BigDecimal's <code>remainder</code> method.
    </p>
    <p>
      See <a href='#modulo'><code>modulo</code></a> for a description of the other modulo modes.
    </p>
    <pre>
1 % 0.9                                  // 0.09999999999999998
x = new Decimal(1)
x.modulo(0.9)                            // '0.1'

y = new Decimal(8)
z = new Decimal(-3)
Decimal.modulo = 1
y.mod(z)                                 // '2'
Decimal.modulo = 3
y.mod(z)                                 // '-1'</pre>


    <h5 id="exp">naturalExponential<code class='inset'>.exp() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the base <code>e</code> (Euler's number, the base of the
      natural logarithm) exponential of the value of this Decimal, rounded to
      <a href='#precision'><code>precision</code></a> significant digits using rounding mode
      <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      The <code><a href='#ln'>naturalLogarithm</a></code> function is the inverse of this function.
    </p>
    <pre>
x = new Decimal(1)
x.naturalExponential()                   // '2.7182818284590452354'
y = new Decimal(2)
y.exp()                                  // '7.3890560989306502272'</pre>
     <p>
      The return value will be correctly rounded, i.e. rounded as if the result was first calculated
      to an infinite number of correct digits before rounding. (The mathematical result of the
      exponential function is non-terminating, unless its argument is <code>0</code>).
    </p>
    <p>The performance of this method degrades exponentially with increasing digits.</p>


    <h5 id="ln">naturalLogarithm<code class='inset'>.ln() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the natural logarithm of the value of this Decimal,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      The natural logarithm is the inverse of the <code><a href='#exp'>naturalExponential</a></code>
      function.
    </p>
    <pre>
x = new Decimal(10)
x.naturalLogarithm()                     // '2.3026'
y = new Decimal('1.23e+30')
y.ln()                                   // '69.28'</pre>
    <p>
      The return value will be correctly rounded, i.e. rounded as if the result was first calculated
      to an infinite number of correct digits before rounding. (The mathematical result of the
      natural logarithm function is non-terminating, unless its argument is <code>1</code>).
    </p>
    <p>
      Internally, this method is dependent on a constant whose value is the natural logarithm of
      <code>10</code>. This <code>LN10</code> variable in the source code currently has a precision
      of <code>1025</code> digits, meaning that this method can accurately calculate up to
      <code>1000</code> digits.
    </p>
    <p>
      If more than <code>1000</code> digits is required then the precision of <code>LN10</code>
      will need to be increased to <code>25</code> digits more than is required - though, as the
      time-taken by this method increases exponentially with increasing digits, it is unlikely to be
      viable to calculate over <code>1000</code> digits anyway.
    </p>


    <h5 id="neg">negated<code class='inset'>.neg() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the value of this Decimal negated, i.e. multiplied by
      <code>-1</code>.
    </p>
    <p>
      The return value is not affected by the value of the
      <a href='#precision'><code>precision</code></a> setting.
    </p>
    <pre>
x = new Decimal(1.8)
x.negated()                              // '-1.8'
y = new Decimal(-1.3)
y.neg()                                  // '1.3'</pre>


    <h5 id="add">plus<code class='inset'>.plus(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns a new Decimal whose value is the value of this Decimal plus <code>x</code>, rounded to
      <a href='#precision'><code>precision</code></a> significant digits using rounding mode
      <a href='#rounding'><code>rounding</code></a>.
    </p>
    <pre>
0.1 + 0.2                                // 0.30000000000000004
x = new Decimal(0.1)
y = x.plus(0.2)                          // '0.3'
new Decimal(0.7).plus(x).plus(y)         // '1.1'</pre>


    <h5 id="sd">precision<code class='inset'>.sd([include_zeros]) <i>&rArr; number</i></code></h5>
    <p>Returns the number of significant digits of the value of this Decimal.</p>
    <p>
      If <code>include_zeros</code> is <code>true</code> or <code>1</code> then any trailing zeros
      of the integer part of a number are counted as significant digits, otherwise they are not.
    </p>
    <pre>
x = new Decimal(1.234)
x.precision()                            // '4'
y = new Decimal(987000)
y.sd()                                   // '3'
y.sd(true)                               // '6'</pre>


    <h5 id="round">round<code class='inset'>.round() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the value of this Decimal rounded to a whole number using
      rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      To emulate <code>Math.round</code>, set <a href='#rounding'><code>rounding</code></a> to
      <code>7</code>, i.e. <a href='#modes'><code>ROUND_HALF_CEIL</code></a>.
    </p>
    <pre>
Decimal.set({ rounding: 4 })
x = 1234.5
x.round()                                // '1235'

Decimal.rounding = Decimal.ROUND_DOWN
x.round()                                // '1234'
x                                        // '1234.5'</pre>


    <h5 id="sin">sine<code class='inset'>.sin() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the sine of the value in radians of this Decimal,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>-1, 1</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(0.5)
x.sine()                                 // '0.47942553860420300027'
y = new Decimal(0.75)
y.sin()                                  // '0.68163876002333416673'</pre>


    <h5 id="sqrt">squareRoot<code class='inset'>.sqrt() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the square root of this Decimal, rounded to
      <a href='#precision'><code>precision</code></a> significant digits using rounding mode
      <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      The return value will be correctly rounded, i.e. rounded as if the result was first calculated
      to an infinite number of correct digits before rounding.
    </p>
    <p>
      This method is much faster than using the <a href='#pow'><code>toPower</code></a> method with
      an exponent of <code>0.5</code>.
    </p>
    <pre>
x = new Decimal(16)
x.squareRoot()                           // '4'
y = new Decimal(3)
y.sqrt()                                 // '1.73205080756887729353'
y.sqrt().eq( y.pow(0.5) )                // true</pre>


    <h5 id="tan">tangent<code class='inset'>.tan() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the tangent of the value in radians of this Decimal,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      Domain: [<code>-Infinity, Infinity</code>]<br />
      Range: [<code>-Infinity, Infinity</code>]
    </p>
    <p>See <a href='#Pi'><code>Pi</code></a> for the precision limit of this method.</p>
    <pre>
x = new Decimal(0.5)
x.tangent()                              // '0.54630248984379051326'
y = new Decimal(0.75)
y.tan()                                  // '0.93159645994407246117'</pre>


    <h5 id="mul">times<code class='inset'>.times(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i></p>
    <p>
      Returns a new Decimal whose value is the value of this Decimal times <code>x</code>,
      rounded to <a href='#precision'><code>precision</code></a> significant digits using rounding
      mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <pre>
0.6 * 3                                  // 1.7999999999999998
x = new Decimal(0.6)
y = x.times(3)                           // '1.8'
new Decimal('7e+500').times(y)           // '1.26e+501'</pre>


    <h5 id="toBinary">
      toBinary<code class='inset'>.toBinary([sd [, rm]]) <i>&rArr; string</i></code>
    </h5>
    <p>
      <code>sd</code>: <i>number</i>: integer, <code>0</code> to <code>1e+9</code> inclusive<br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive
    </p>
    <p>
      Returns a string representing the value of this Decimal in binary, rounded to <code>sd</code>
      significant digits using rounding mode <code>rm</code>.
    </p>
    <p>
      If <code>sd</code> is defined, the return value will use binary exponential notation.
    </p>
    <p>
      If <code>sd</code> is omitted, the return value will be rounded to
      <a href='#precision'><code>precision</code></a> significant digits.
    </p>
    <p>
      If <code>rm</code> is omitted, rounding mode <a href='#rounding'><code>rounding</code></a>
      will be used.
    </p>
    <p>Throws on an invalid <code>sd</code> or <code>rm</code> value.</p>
    <pre>
x = new Decimal(256)
x.toBinary()                             // '0b100000000'
x.toBinary(1)                            // '0b1p+8'</pre>


    <h5 id="toDP">
      toDecimalPlaces<code class='inset'>.toDP([dp [, rm]]) <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      <code>dp</code>: <i>number</i>: integer, <code>0</code> to <code>1e+9</code> inclusive<br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive.
    </p>
    <p>
      Returns a new Decimal whose value is the value of this Decimal rounded to <code>dp</code>
      decimal places using rounding mode <code>rm</code>.
    </p>
    <p>
      If <code>dp</code> is omitted, the return value will have the same value as this Decimal.
    </p>
    <p>
      If <code>rm</code> is omitted, rounding mode <a href='#rounding'><code>rounding</code></a>
      is used.
    </p>
    <p>Throws on an invalid <code>dp</code> or <code>rm</code> value.</p>
    <pre>
x = new Decimal(12.34567)
x.toDecimalPlaces(0)                      // '12'
x.toDecimalPlaces(1, Decimal.ROUND_UP)    // '12.4'

y = new Decimal(9876.54321)
y.toDP(3)                           // '9876.543'
y.toDP(1, 0)                        // '9876.6'
y.toDP(1, Decimal.ROUND_DOWN)       // '9876.5'</pre>


    <h5 id="toExponential">
      toExponential<code class='inset'>.toExponential([dp [, rm]]) <i>&rArr; string</i></code>
    </h5>
    <p>
      <code>dp</code>: <i>number</i>: integer, <code>0</code> to <code>1e+9</code> inclusive<br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive
    </p>
    <p>
      Returns a string representing the value of this Decimal in exponential notation rounded
      using rounding mode <code>rm</code> to <code>dp</code> decimal places, i.e with one digit
      before the decimal point and <code>dp</code> digits after it.
    </p>
    <p>
      If the value of this Decimal in exponential notation has fewer than <code>dp</code> fraction
      digits, the return value will be appended with zeros accordingly.
    </p>
    <p>
      If <code>dp</code> is omitted, the number of digits after the decimal point defaults to the
      minimum number of digits necessary to represent the value exactly.
    </p>
    <p>
      If <code>rm</code> is omitted, rounding mode <a href='#rounding'><code>rounding</code></a> is
      used.
    </p>
    <p>Throws on an invalid <code>dp</code> or <code>rm</code> value.</p>
    <pre>
x = 45.6
y = new Decimal(x)
x.toExponential()                        // '4.56e+1'
y.toExponential()                        // '4.56e+1'
x.toExponential(0)                       // '5e+1'
y.toExponential(0)                       // '5e+1'
x.toExponential(1)                       // '4.6e+1'
y.toExponential(1)                       // '4.6e+1'
y.toExponential(1, Decimal.ROUND_DOWN)   // '4.5e+1'
x.toExponential(3)                       // '4.560e+1'
y.toExponential(3)                       // '4.560e+1'</pre>


    <h5 id="toFixed">
      toFixed<code class='inset'>.toFixed([dp [, rm]]) <i>&rArr; string</i></code>
    </h5>
    <p>
      <code>dp</code>: <i>number</i>: integer, <code>0</code> to <code>1e+9</code> inclusive<br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive
    </p>
    <p>
      Returns a string representing the value of this Decimal in normal (fixed-point) notation
      rounded to <code>dp</code> decimal places using rounding mode <code>rm</code>.
    </p>
    <p>
      If the value of this Decimal in normal notation has fewer than <code>dp</code> fraction
      digits, the return value will be appended with zeros accordingly.
    </p>
    <p>
      Unlike <code>Number.prototype.toFixed</code>, which returns exponential notation if a number
      is greater or equal to <code>10<sup>21</sup></code>, this method will always return normal
      notation.
    </p>
    <p>
      If <code>dp</code> is omitted, the return value will be unrounded and in normal notation. This
      is unlike <code>Number.prototype.toFixed</code>, which returns the value to zero decimal
      places, but is useful when because of the current
      <a href="#toExpNeg"><code>toExpNeg</code></a> or
      <a href="#toExpPos"><code>toExpNeg</code></a> values,
      <code><a href='#toString'>toString</a></code> returns exponential notation.
    </p>
    <p>
      If <code>rm</code> is omitted, rounding mode <a href='#rounding'><code>rounding</code></a> is
      used.
    </p>
    <p>Throws on an invalid <code>dp</code> or <code>rm</code> value.</p>
    <pre>
x = 3.456
y = new Decimal(x)
x.toFixed()                       // '3'
y.toFixed()                       // '3.456'
y.toFixed(0)                      // '3'
x.toFixed(2)                      // '3.46'
y.toFixed(2)                      // '3.46'
y.toFixed(2, Decimal.ROUND_DOWN)  // '3.45'
x.toFixed(5)                      // '3.45600'
y.toFixed(5)                      // '3.45600'</pre>


    <h5 id="toFraction">
      toFraction
      <code class='inset'>.toFraction([max_denominator]) <i>&rArr; [Decimal, Decimal]</i></code>
    </h5>
    <p>
      <code>max_denominator</code>: <i>number|string|Decimal</i>: <code>1</code> &gt;= integer &lt;
      <code>Infinity</code>
    </p>
    <p>
      Returns an array of two Decimals representing the value of this Decimal as a simple fraction
      with an integer numerator and an integer denominator. The denominator will be a positive
      non-zero value less than or equal to <code>max_denominator</code>.
    </p>
    <p>
      If a maximum denominator is omitted, the denominator will be the lowest value necessary to
      represent the number exactly.
    </p>
    <p>Throws on an invalid <code>max_denominator</code> value.</p>
    <pre>
x = new Decimal(1.75)
x.toFraction()                       // '7, 4'

pi = new Decimal('3.14159265358')
pi.toFraction()                      // '157079632679,50000000000'
pi.toFraction(100000)                // '312689, 99532'
pi.toFraction(10000)                 // '355, 113'
pi.toFraction(100)                   // '311, 99'
pi.toFraction(10)                    // '22, 7'
pi.toFraction(1)                     // '3, 1'</pre>


    <h5 id="toHex">
      toHexadecimal<code class='inset'>.toHex([sd [, rm]]) <i>&rArr; string</i></code>
    </h5>
    <p>
      <code>sd</code>: <i>number</i>: integer, <code>0</code> to <code>1e+9</code> inclusive<br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive
    </p>
    <p>
      Returns a string representing the value of this Decimal in hexadecimal, rounded to
      <code>sd</code> significant digits using rounding mode <code>rm</code>.
    </p>
    <p>
      If <code>sd</code> is defined, the return value will use binary exponential notation.
    </p>
    <p>
      If <code>sd</code> is omitted, the return value will be rounded to
      <a href='#precision'><code>precision</code></a> significant digits.
    </p>
    <p>
      If <code>rm</code> is omitted, rounding mode <a href='#rounding'><code>rounding</code></a>
      will be used.
    </p>
    <p>Throws on an invalid <code>sd</code> or <code>rm</code> value.</p>
    <pre>
x = new Decimal(256)
x.toHexadecimal()                        // '0x100'
x.toHex(1)                               // '0x1p+8'</pre>


    <h5 id="toJSON">toJSON<code class='inset'>.toJSON() <i>&rArr; string</i></code></h5>
    <p>As <a href='#valueOf'><code>valueOf</code></a>.</p>


    <h5 id="toNearest">
      toNearest<code class='inset'>.toNearest(x [, rm]) <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      <code>x</code>: <i>number|string|Decimal</i><br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive
    </p>
    <p>
      Returns a new Decimal whose value is the nearest multiple of <code>x</code> in the direction
      of rounding mode <code>rm</code>, or <a href='#rounding'><code>rounding</code></a> if
      <code>rm</code> is omitted, to the value of this Decimal.
    </p>
    <p>
      The return value will always have the same sign as this Decimal, unless either this Decimal
      or <code>x</code> is <code>NaN</code>, in which case the return value will be also be
      <code>NaN</code>.
    </p>
    <p>
      The return value is not affected by the value of the
      <a href='#precision'><code>precision</code></a> setting.
    </p>
    <pre>
x = new Decimal(1.39)
x.toNearest(0.25)                        // '1.5'

y = new Decimal(9.499)
y.toNearest(0.5, Decimal.ROUND_UP)       // '9.5'
y.toNearest(0.5, Decimal.ROUND_DOWN)     // '9'</pre>


    <h5 id="toNumber">toNumber<code class='inset'>.toNumber() <i>&rArr; number</i></code></h5>
    <p>Returns the value of this Decimal converted to a primitive number.</p>
    <p>
      Type coercion with, for example, JavaScript's unary plus operator will also work, except that
      a Decimal with the value minus zero will convert to positive zero.
    </p>
    <pre>
x = new Decimal(456.789)
x.toNumber()                   // 456.789
+x                             // 456.789

y = new Decimal('45987349857634085409857349856430985')
y.toNumber()                   // 4.598734985763409e+34

z = new Decimal(-0)
1 / +z                         // Infinity
1 / z.toNumber()               // -Infinity</pre>


     <h5 id="toOctal">
      toOctal<code class='inset'>.toOctal([sd [, rm]]) <i>&rArr; string</i></code>
    </h5>
    <p>
      <code>sd</code>: <i>number</i>: integer, <code>0</code> to <code>1e+9</code> inclusive<br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive
    </p>
    <p>
      Returns a string representing the value of this Decimal in octal, rounded to <code>sd</code>
      significant digits using rounding mode <code>rm</code>.
    </p>
    <p>
      If <code>sd</code> is defined, the return value will use binary exponential notation.
    </p>
    <p>
      If <code>sd</code> is omitted, the return value will be rounded to
      <a href='#precision'><code>precision</code></a> significant digits.
    </p>
    <p>
      If <code>rm</code> is omitted, rounding mode <a href='#rounding'><code>rounding</code></a>
      will be used.
    </p>
    <p>Throws on an invalid <code>sd</code> or <code>rm</code> value.</p>
    <pre>
x = new Decimal(256)
x.toOctal()                              // '0o400'
x.toOctal(1)                             // '0o1p+8'</pre>


    <h5 id="pow">toPower<code class='inset'>.pow(x) <i>&rArr; Decimal</i></code></h5>
    <p><code>x</code>: <i>number|string|Decimal</i>: integer or non-integer</p>
    <p>
      Returns a new Decimal whose value is the value of this Decimal raised to the power
      <code>x</code>, rounded to <a href='#precision'><code>precision</code></a> significant digits
      using rounding mode <a href='#rounding'><code>rounding</code></a>.
    </p>
    <p>
      The performance of this method degrades exponentially with increasing digits. For
      non-integer exponents in particular, the performance of this method may not be adequate.
    </p>
    <pre>
Math.pow(0.7, 2)               // 0.48999999999999994
x = new Decimal(0.7)
x.toPower(2)                   // '0.49'
new Decimal(3).pow(-2)         // '0.11111111111111111111'

new Decimal(1217652.23).pow('98765.489305603941')
// '4.8227010515242461181e+601039'</pre>
    <p><i>Is the pow function guaranteed to be correctly rounded?</i></p>
    <p>
      The return value will <i>almost always</i> be correctly rounded, i.e. rounded as if the result
      was first calculated to an infinite number of correct digits before rounding. If a result is
      incorrectly rounded the maximum error will be <code>1</code> <i>ulp</i> (unit in the last
      place).
    </p>
    <p>For non-integer and larger exponents this method uses the formula</p>
    <blockquote><code>x<sup>y</sup> = exp(y*ln(x))</code></blockquote>
    <p>
      As the mathematical return values of the <a href='#exp'><code>exp</code></a> and
      <a href='#ln'><code>ln</code></a> functions are both non-terminating (excluding arguments of
      <code>0</code> or <code>1</code>), the values of the Decimals returned by the functions as
      implemented by this library will necessarily be rounded approximations, which means that there
      can be no guarantee of correct rounding when they are combined in the above formula.
    </p>
    <p>
      The return value may, depending on the rounding mode, be incorrectly rounded only if the first
      <code>15</code> rounding digits are <code>15</code> zeros (and there are non-zero digits
      following at some point), or <code>15</code> nines, or a <code>5</code> or <code>4</code>
      followed by <code>14</code> nines.
    </p>
    <p>
      Therefore, assuming the first <code>15</code> rounding digits are each equally likely to be
      any digit, <code>0-9</code>, the probability of an incorrectly rounded result is less than
      <code>1</code> in <code>250,000,000,000,000</code>.
    </p>
    <p>
      An example of incorrect rounding:
    </p>
    <pre>
Decimal.set({ precision: 20, rounding: 1 })
new Decimal(28).pow('6.166675020000903537297764507632802193308677149')
// 839756321.64088511</pre>
    <p>As the exact mathematical result begins</p>
    <pre>839756321.6408851099999999999999999999999999998969466049426031167...</pre>
    <p>
      and the rounding mode is set to <code><a href='#modes'>ROUND_DOWN</a></code>, the correct
      return value should be
    </p>
    <pre>839756321.64088510999</pre>


    <h5 id="toPrecision">
      toPrecision<code class='inset'>.toPrecision([sd [, rm]]) <i>&rArr; string</i></code>
    </h5>
    <p>
      <code>sd</code>: <i>number</i>: integer, <code>1</code> to <code>1e+9</code> inclusive<br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive
    </p>
    <p>
      Returns a string representing the value of this Decimal rounded to <code>sd</code> significant
      digits using rounding mode <code>rm</code>.
    </p>
    <p>
      If <code>sd</code> is less than the number of digits necessary to represent the integer part
      of the value in normal (fixed-point) notation, then exponential notation is used.
    </p>
    <p>
      If <code>sd</code> is omitted, the return value is the same as
      <code><a href='#toString'>toString</a></code>.
    </p>
    <p>
      If <code>rm</code> is omitted, rounding mode <a href='#rounding'><code>rounding</code></a> is
      used.
    </p>
    <p>Throws on an invalid <code>sd</code> or <code>rm</code> value.</p>
    <pre>
x = 45.6
y = new Decimal(x)
x.toPrecision()                          // '45.6'
y.toPrecision()                          // '45.6'
x.toPrecision(1)                         // '5e+1'
y.toPrecision(1)                         // '5e+1'
y.toPrecision(2, Decimal.ROUND_UP)       // '46'
y.toPrecision(2, Decimal.ROUND_DOWN)     // '45'
x.toPrecision(5)                         // '45.600'
y.toPrecision(5)                         // '45.600'</pre>


    <h5 id="toSD">
      toSignificantDigits<code class='inset'>.toSD([sd [, rm]]) <i>&rArr; Decimal</i></code>
    </h5>
    <p>
      <code>sd</code>: <i>number</i>: integer, <code>1</code> to <code>1e+9</code> inclusive.<br />
      <code>rm</code>: <i>number</i>: integer, <code>0</code> to <code>8</code> inclusive.
    </p>
    <p>
      Returns a new Decimal whose value is the value of this Decimal rounded to <code>sd</code>
      significant digits using rounding mode <code>rm</code>.
    </p>
    <p>
      If <code>sd</code> is omitted, the return value will be rounded to
      <a href='#precision'><code>precision</code></a> significant digits.
    </p>
    <p>
      If <code>rm</code> is omitted, rounding mode <a href='#rounding'><code>rounding</code></a>
      will be used.
    </p>
    <p>Throws on an invalid <code>sd</code> or <code>rm</code> value.</p>
    <pre>
Decimal.set({ precision: 5, rounding: 4 })
x = new Decimal(9876.54321)

x.toSignificantDigits()                          // '9876.5'
x.toSignificantDigits(6)                         // '9876.54'
x.toSignificantDigits(6, Decimal.ROUND_UP)       // '9876.55'
x.toSD(2)                                        // '9900'
x.toSD(2, 1)                                     // '9800'
x                                                // '9876.54321'</pre>


    <h5 id="toString">toString<code class='inset'>.toString() <i>&rArr; string</i></code></h5>
    <p>Returns a string representing the value of this Decimal.</p>
    <p>
      If this Decimal has a positive exponent that is equal to or greater than
      <a href="#toExpPos"><code>toExpPos</code></a>, or a negative exponent equal to or less than
      <a href="#toExpPos"><code>toExpNeg</code></a>, then exponential notation will be returned.
    </p>
    <pre>
x = new Decimal(750000)
x.toString()                             // '750000'
Decimal.set({ toExpPos: 5 })
x.toString()                             // '7.5e+5'

Decimal.set({ precision: 4 })
y = new Decimal('1.23456789')
y.toString()                             // '1.23456789'</pre>


    <h5 id="trunc">truncated<code class='inset'>.trunc() <i>&rArr; Decimal</i></code></h5>
    <p>
      Returns a new Decimal whose value is the value of this Decimal truncated to a whole number.
    </p>
    <p>
      The return value is not affected by the value of the
      <a href='#precision'><code>precision</code></a> setting.
    </p>
    <pre>
x = new Decimal(123.456)
x.truncated()                            // '123'
y = new Decimal(-12.3)
y.trunc()                                // '-12'</pre>


    <h5 id="valueOf">valueOf<code class='inset'>.valueOf() <i>&rArr; string</i></code></h5>
    <p>As <a href='#toString'><code>toString</code></a>, but zero is signed.</p>
    <pre>
x = new Decimal(-0)
x.valueOf()                              // '-0'</pre>


    <h4 id="instance-properties">Properties</h4>
    <p>
      The value of a Decimal is stored in a normalised base <code>10000000</code> floating point
      format.
    </p>
    <p>
      A Decimal instance is an object with three properties:
    </p>
    <table>
      <tr>
        <th>Property</th>
        <th>Description</th>
        <th>Type</th>
        <th>Value</th>
      </tr>
      <tr>
        <td class='centre' id='digits'><b>d</b></td>
        <td>digits</td>
        <td><i>number</i><code style='color:#000'>[]</code></td>
        <td> Array of integers, each <code>0</code> - <code>1e7</code>, or <code>null</code></td>
      </tr>
      <tr>
        <td class='centre' id='exponent'><b>e</b></td>
        <td>exponent</td>
        <td><i>number</i></td>
        <td>Integer, <code>-9e15</code> to <code>9e15</code> inclusive, or <code>NaN</code></td>
      </tr>
      <tr>
        <td class='centre' id='sign'><b>s</b></td>
        <td>sign</td>
        <td><i>number</i></td>
        <td><code>-1</code>, <code>1</code>, or <code>NaN</code></td>
      </tr>
    </table>
    <p>All the properties are best considered to be read-only.</p>
    <p>
      As with JavaScript numbers, the original exponent and fractional trailing zeros of a value
      are not preserved.
    </p>
    <pre>
x = new Decimal(0.123)                   // '0.123'
x.toExponential()                        // '1.23e-1'
x.d                                      // [ 1230000 ]
x.e                                      // -1
x.s                                      // 1

y = new Number(-123.4567000e+2)          // '-12345.67'
y.toExponential()                        // '-1.234567e+4'
z = new Decimal('-123.4567000e+2')       // '-12345.67'
z.toExponential()                        // '-1.234567e+4'
z.d                                      // [ 12345, 6700000 ]
z.e                                      // 4
z.s                                      // -1</pre>


    <h4 id="zero-nan-infinity">Zero, NaN and Infinity</h4>
    <p>
      The table below shows how <code>&plusmn;0</code>, <code>NaN</code> and
      <code>&plusmn;Infinity</code> are stored.
    </p>
       <table>
      <tr>
        <th> </th>
        <th>&plusmn;0</th>
        <th>NaN</th>
        <th>&plusmn;Infinity</th>
      </tr>
      <tr>
        <td><b>&nbsp;d&nbsp;</b></td>
        <td><code>[0]</code></td>
        <td><code>null</code></td>
        <td><code>null</code></td>
      </tr>
      <tr>
        <td><b>&nbsp;e&nbsp;</b></td>
        <td><code>0</code></td>
        <td><code>NaN</code></td>
        <td><code>NaN</code></td>
      </tr>
      <tr>
        <td><b>&nbsp;s&nbsp;</b></td>
        <td><code>&plusmn;1</code></td>
        <td><code>NaN</code></td>
        <td><code>&plusmn;1</code></td>
      </tr>
    </table>
    <pre>
x = new Number(-0)                       // 0
1 / x == -Infinity                       // true

y = new Decimal(-0)
y.d                                      // '0' ( [0].toString() )
y.e                                      //  0
y.s                                      // -1
y.toString()                             // '0'
y.valueOf()                              // '-0'</pre>


    <h4 id='Errors'>Errors</h4>
    <p>
      The errors that are thrown are generic <code>Error</code> objects whose <code>message</code>
      property begins with <code>"[DecimalError]"</code>.
    </p>
    <p>To determine if an exception is a Decimal Error:</p>
    <pre>
try {
    // ...
} catch (e) {
    if ( e instanceof Error && /DecimalError/.test(e.message) ) {
        // ...
    }
}</pre>


    <h4 id='Pi'>Pi</h4>
    <p>
      The maximum precision of the trigonometric methods is dependent on the internal value of the
      constant pi, which is defined as the string <code>PI</code> near the top of the source file.
    </p>
    <p>
      It has a precision of <code>1025</code> digits, meaning that the trigonometric methods
      can calculate up to just over <code>1000</code> digits, but the actual figure depends on the
      precision of the argument passed to them. To calculate the actual figure use:
    </p>
    <p><b>maximum_result_precision = 1000 - argument_precision</b></p>
      For example, the following both work fine:
    <pre>
Decimal.set({precision: 991}).tan(123456789)
Decimal.set({precision: 9}).tan(991_digit_number)</pre>
    <p>
      as, for each, the result precision plus the argument precision, i.e. <code>991 + 9</code> and
      <code>9 + 991</code>, is less than or equal to <code>1000</code>.
    </p>
    <p>
      If greater precision is required then the value of <code>PI</code> will need to be extended to
      about <code>25</code> digits more than the precision required. The time taken by the methods
      will then be the limiting factor.
    </p>
    <p>
      The value can also be shortened to reduce the size of the source file if such high precision
      is not required.
    </p>
    <p>To get the value of pi:</p>
    <pre>
pi = Decimal.acos(-1)</pre>


    <h2 id='faq'>FAQ</h2>
    <h6>Why are trailing fractional zeros removed from Decimals?</h6>
    <p>
      Some arbitrary-precision libraries retain trailing fractional zeros as they can indicate the
      precision of a value. This can be useful but the results of arithmetic operations can be
      misleading.
    </p>
    <pre>
x = new BigDecimal("1.0")
y = new BigDecimal("1.1000")
z = x.add(y)                      // 2.1000

x = new BigDecimal("1.20")
y = new BigDecimal("3.45000")
z = x.multiply(y)                 // 4.1400000</pre>
    <p>
      To specify the precision of a value is to specify that the value lies
      within a certain range.
    </p>
    <p>
      In the first example, <code>x</code> has a value of <code>1.0</code>. The trailing zero shows
      the precision of the value, implying that it is in the range <code>0.95</code> to
      <code>1.05</code>. Similarly, the precision indicated by the trailing zeros of <code>y</code>
      indicates that the value is in the range <code>1.09995</code> to <code>1.10005</code>.
    </p>
    <p>
      If we  add the two lowest values in the ranges we have, <code>0.95 + 1.09995 = 2.04995</code>,
      and if we add the two highest values we have, <code>1.05 + 1.10005 = 2.15005</code>, so the
      range of the result of the addition implied by the precision of its operands is
      <code>2.04995</code> to <code>2.15005</code>.
    </p>
    <p>
      The result given by BigDecimal of <code>2.1000</code> however, indicates that the value is in
      the range <code>2.09995</code> to <code>2.10005</code> and therefore the precision implied by
      its trailing zeros may be misleading.
    </p>
    <p>
      In the second example, the true range is <code>4.122744</code> to <code>4.157256</code> yet
      the BigDecimal answer of <code>4.1400000</code> indicates a range of <code>4.13999995</code>
      to  <code>4.14000005</code>. Again, the precision implied by the trailing zeros may be
      misleading.
    </p>
    <p>
      This library, like binary floating point and most calculators, does not retain trailing
      fractional zeros. Instead, the <code>toExponential</code>, <code>toFixed</code> and
      <code>toPrecision</code> methods enable trailing zeros to be added if and when required.<br />
    </p>
  </div>

</body>
</html>