es2015.js
8.53 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
'use strict';
var test = require('tape');
var toPrimitive = require('../es2015');
var is = require('object-is');
var forEach = require('foreach');
var functionName = require('function.prototype.name');
var debug = require('object-inspect');
var hasSymbols = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol';
var hasSymbolToPrimitive = hasSymbols && typeof Symbol.toPrimitive === 'symbol';
test('function properties', function (t) {
t.equal(toPrimitive.length, 1, 'length is 1');
t.equal(functionName(toPrimitive), 'ToPrimitive', 'name is ToPrimitive');
t.end();
});
var primitives = [null, undefined, true, false, 0, -0, 42, NaN, Infinity, -Infinity, '', 'abc'];
test('primitives', function (t) {
forEach(primitives, function (i) {
t.ok(is(toPrimitive(i), i), 'toPrimitive(' + debug(i) + ') returns the same value');
t.ok(is(toPrimitive(i, String), i), 'toPrimitive(' + debug(i) + ', String) returns the same value');
t.ok(is(toPrimitive(i, Number), i), 'toPrimitive(' + debug(i) + ', Number) returns the same value');
});
t.end();
});
test('Symbols', { skip: !hasSymbols }, function (t) {
var symbols = [
Symbol('foo'),
Symbol.iterator,
Symbol['for']('foo') // eslint-disable-line no-restricted-properties
];
forEach(symbols, function (sym) {
t.equal(toPrimitive(sym), sym, 'toPrimitive(' + debug(sym) + ') returns the same value');
t.equal(toPrimitive(sym, String), sym, 'toPrimitive(' + debug(sym) + ', String) returns the same value');
t.equal(toPrimitive(sym, Number), sym, 'toPrimitive(' + debug(sym) + ', Number) returns the same value');
});
var primitiveSym = Symbol('primitiveSym');
var objectSym = Object(primitiveSym);
t.equal(toPrimitive(objectSym), primitiveSym, 'toPrimitive(' + debug(objectSym) + ') returns ' + debug(primitiveSym));
t.equal(toPrimitive(objectSym, String), primitiveSym, 'toPrimitive(' + debug(objectSym) + ', String) returns ' + debug(primitiveSym));
t.equal(toPrimitive(objectSym, Number), primitiveSym, 'toPrimitive(' + debug(objectSym) + ', Number) returns ' + debug(primitiveSym));
t.end();
});
test('Arrays', function (t) {
var arrays = [[], ['a', 'b'], [1, 2]];
forEach(arrays, function (arr) {
t.equal(toPrimitive(arr), String(arr), 'toPrimitive(' + debug(arr) + ') returns the string version of the array');
t.equal(toPrimitive(arr, String), String(arr), 'toPrimitive(' + debug(arr) + ') returns the string version of the array');
t.equal(toPrimitive(arr, Number), String(arr), 'toPrimitive(' + debug(arr) + ') returns the string version of the array');
});
t.end();
});
test('Dates', function (t) {
var dates = [new Date(), new Date(0), new Date(NaN)];
forEach(dates, function (date) {
t.equal(toPrimitive(date), String(date), 'toPrimitive(' + debug(date) + ') returns the string version of the date');
t.equal(toPrimitive(date, String), String(date), 'toPrimitive(' + debug(date) + ') returns the string version of the date');
t.ok(is(toPrimitive(date, Number), Number(date)), 'toPrimitive(' + debug(date) + ') returns the number version of the date');
});
t.end();
});
var coercibleObject = { valueOf: function () { return 3; }, toString: function () { return 42; } };
var valueOfOnlyObject = { valueOf: function () { return 4; }, toString: function () { return {}; } };
var toStringOnlyObject = { valueOf: function () { return {}; }, toString: function () { return 7; } };
var coercibleFnObject = {
valueOf: function () { return function valueOfFn() {}; },
toString: function () { return 42; }
};
var uncoercibleObject = { valueOf: function () { return {}; }, toString: function () { return {}; } };
var uncoercibleFnObject = {
valueOf: function () { return function valueOfFn() {}; },
toString: function () { return function toStrFn() {}; }
};
test('Objects', function (t) {
t.equal(toPrimitive(coercibleObject), coercibleObject.valueOf(), 'coercibleObject with no hint coerces to valueOf');
t.equal(toPrimitive(coercibleObject, Number), coercibleObject.valueOf(), 'coercibleObject with hint Number coerces to valueOf');
t.equal(toPrimitive(coercibleObject, String), coercibleObject.toString(), 'coercibleObject with hint String coerces to non-stringified toString');
t.equal(toPrimitive(coercibleFnObject), coercibleFnObject.toString(), 'coercibleFnObject coerces to non-stringified toString');
t.equal(toPrimitive(coercibleFnObject, Number), coercibleFnObject.toString(), 'coercibleFnObject with hint Number coerces to non-stringified toString');
t.equal(toPrimitive(coercibleFnObject, String), coercibleFnObject.toString(), 'coercibleFnObject with hint String coerces to non-stringified toString');
t.equal(toPrimitive({}), '[object Object]', '{} with no hint coerces to Object#toString');
t.equal(toPrimitive({}, Number), '[object Object]', '{} with hint Number coerces to Object#toString');
t.equal(toPrimitive({}, String), '[object Object]', '{} with hint String coerces to Object#toString');
t.equal(toPrimitive(toStringOnlyObject), toStringOnlyObject.toString(), 'toStringOnlyObject returns non-stringified toString');
t.equal(toPrimitive(toStringOnlyObject, Number), toStringOnlyObject.toString(), 'toStringOnlyObject with hint Number returns non-stringified toString');
t.equal(toPrimitive(toStringOnlyObject, String), toStringOnlyObject.toString(), 'toStringOnlyObject with hint String returns non-stringified toString');
t.equal(toPrimitive(valueOfOnlyObject), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject returns valueOf');
t.equal(toPrimitive(valueOfOnlyObject, Number), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject with hint Number returns valueOf');
t.equal(toPrimitive(valueOfOnlyObject, String), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject with hint String returns non-stringified valueOf');
t.test('Symbol.toPrimitive', { skip: !hasSymbolToPrimitive }, function (st) {
var overriddenObject = { toString: st.fail, valueOf: st.fail };
overriddenObject[Symbol.toPrimitive] = function (hint) { return String(hint); };
st.equal(toPrimitive(overriddenObject), 'default', 'object with Symbol.toPrimitive + no hint invokes that');
st.equal(toPrimitive(overriddenObject, Number), 'number', 'object with Symbol.toPrimitive + hint Number invokes that');
st.equal(toPrimitive(overriddenObject, String), 'string', 'object with Symbol.toPrimitive + hint String invokes that');
var nullToPrimitive = { toString: coercibleObject.toString, valueOf: coercibleObject.valueOf };
nullToPrimitive[Symbol.toPrimitive] = null;
st.equal(toPrimitive(nullToPrimitive), toPrimitive(coercibleObject), 'object with no hint + null Symbol.toPrimitive ignores it');
st.equal(toPrimitive(nullToPrimitive, Number), toPrimitive(coercibleObject, Number), 'object with hint Number + null Symbol.toPrimitive ignores it');
st.equal(toPrimitive(nullToPrimitive, String), toPrimitive(coercibleObject, String), 'object with hint String + null Symbol.toPrimitive ignores it');
st.test('exceptions', function (sst) {
var nonFunctionToPrimitive = { toString: sst.fail, valueOf: sst.fail };
nonFunctionToPrimitive[Symbol.toPrimitive] = {};
sst['throws'](toPrimitive.bind(null, nonFunctionToPrimitive), TypeError, 'Symbol.toPrimitive returning a non-function throws');
var uncoercibleToPrimitive = { toString: sst.fail, valueOf: sst.fail };
uncoercibleToPrimitive[Symbol.toPrimitive] = function (hint) {
return { toString: function () { return hint; } };
};
sst['throws'](toPrimitive.bind(null, uncoercibleToPrimitive), TypeError, 'Symbol.toPrimitive returning an object throws');
var throwingToPrimitive = { toString: sst.fail, valueOf: sst.fail };
throwingToPrimitive[Symbol.toPrimitive] = function (hint) { throw new RangeError(hint); };
sst['throws'](toPrimitive.bind(null, throwingToPrimitive), RangeError, 'Symbol.toPrimitive throwing throws');
sst.end();
});
st.end();
});
t.test('exceptions', function (st) {
st['throws'](toPrimitive.bind(null, uncoercibleObject), TypeError, 'uncoercibleObject throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleObject, Number), TypeError, 'uncoercibleObject with hint Number throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleObject, String), TypeError, 'uncoercibleObject with hint String throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleFnObject), TypeError, 'uncoercibleFnObject throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleFnObject, Number), TypeError, 'uncoercibleFnObject with hint Number throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleFnObject, String), TypeError, 'uncoercibleFnObject with hint String throws a TypeError');
st.end();
});
t.end();
});