collection.js
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'use strict';
var $ = require('../internals/export');
var global = require('../internals/global');
var uncurryThis = require('../internals/function-uncurry-this');
var isForced = require('../internals/is-forced');
var defineBuiltIn = require('../internals/define-built-in');
var InternalMetadataModule = require('../internals/internal-metadata');
var iterate = require('../internals/iterate');
var anInstance = require('../internals/an-instance');
var isCallable = require('../internals/is-callable');
var isNullOrUndefined = require('../internals/is-null-or-undefined');
var isObject = require('../internals/is-object');
var fails = require('../internals/fails');
var checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');
var setToStringTag = require('../internals/set-to-string-tag');
var inheritIfRequired = require('../internals/inherit-if-required');
module.exports = function (CONSTRUCTOR_NAME, wrapper, common) {
var IS_MAP = CONSTRUCTOR_NAME.indexOf('Map') !== -1;
var IS_WEAK = CONSTRUCTOR_NAME.indexOf('Weak') !== -1;
var ADDER = IS_MAP ? 'set' : 'add';
var NativeConstructor = global[CONSTRUCTOR_NAME];
var NativePrototype = NativeConstructor && NativeConstructor.prototype;
var Constructor = NativeConstructor;
var exported = {};
var fixMethod = function (KEY) {
var uncurriedNativeMethod = uncurryThis(NativePrototype[KEY]);
defineBuiltIn(NativePrototype, KEY,
KEY == 'add' ? function add(value) {
uncurriedNativeMethod(this, value === 0 ? 0 : value);
return this;
} : KEY == 'delete' ? function (key) {
return IS_WEAK && !isObject(key) ? false : uncurriedNativeMethod(this, key === 0 ? 0 : key);
} : KEY == 'get' ? function get(key) {
return IS_WEAK && !isObject(key) ? undefined : uncurriedNativeMethod(this, key === 0 ? 0 : key);
} : KEY == 'has' ? function has(key) {
return IS_WEAK && !isObject(key) ? false : uncurriedNativeMethod(this, key === 0 ? 0 : key);
} : function set(key, value) {
uncurriedNativeMethod(this, key === 0 ? 0 : key, value);
return this;
}
);
};
var REPLACE = isForced(
CONSTRUCTOR_NAME,
!isCallable(NativeConstructor) || !(IS_WEAK || NativePrototype.forEach && !fails(function () {
new NativeConstructor().entries().next();
}))
);
if (REPLACE) {
// create collection constructor
Constructor = common.getConstructor(wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER);
InternalMetadataModule.enable();
} else if (isForced(CONSTRUCTOR_NAME, true)) {
var instance = new Constructor();
// early implementations not supports chaining
var HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) != instance;
// V8 ~ Chromium 40- weak-collections throws on primitives, but should return false
var THROWS_ON_PRIMITIVES = fails(function () { instance.has(1); });
// most early implementations doesn't supports iterables, most modern - not close it correctly
// eslint-disable-next-line no-new -- required for testing
var ACCEPT_ITERABLES = checkCorrectnessOfIteration(function (iterable) { new NativeConstructor(iterable); });
// for early implementations -0 and +0 not the same
var BUGGY_ZERO = !IS_WEAK && fails(function () {
// V8 ~ Chromium 42- fails only with 5+ elements
var $instance = new NativeConstructor();
var index = 5;
while (index--) $instance[ADDER](index, index);
return !$instance.has(-0);
});
if (!ACCEPT_ITERABLES) {
Constructor = wrapper(function (dummy, iterable) {
anInstance(dummy, NativePrototype);
var that = inheritIfRequired(new NativeConstructor(), dummy, Constructor);
if (!isNullOrUndefined(iterable)) iterate(iterable, that[ADDER], { that: that, AS_ENTRIES: IS_MAP });
return that;
});
Constructor.prototype = NativePrototype;
NativePrototype.constructor = Constructor;
}
if (THROWS_ON_PRIMITIVES || BUGGY_ZERO) {
fixMethod('delete');
fixMethod('has');
IS_MAP && fixMethod('get');
}
if (BUGGY_ZERO || HASNT_CHAINING) fixMethod(ADDER);
// weak collections should not contains .clear method
if (IS_WEAK && NativePrototype.clear) delete NativePrototype.clear;
}
exported[CONSTRUCTOR_NAME] = Constructor;
$({ global: true, constructor: true, forced: Constructor != NativeConstructor }, exported);
setToStringTag(Constructor, CONSTRUCTOR_NAME);
if (!IS_WEAK) common.setStrong(Constructor, CONSTRUCTOR_NAME, IS_MAP);
return Constructor;
};