_collection.js
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'use strict';
var global = require('./_global');
var $export = require('./_export');
var meta = require('./_meta');
var fails = require('./_fails');
var hide = require('./_hide');
var redefineAll = require('./_redefine-all');
var forOf = require('./_for-of');
var anInstance = require('./_an-instance');
var isObject = require('./_is-object');
var setToStringTag = require('./_set-to-string-tag');
var dP = require('./_object-dp').f;
var each = require('./_array-methods')(0);
var DESCRIPTORS = require('./_descriptors');
module.exports = function (NAME, wrapper, methods, common, IS_MAP, IS_WEAK) {
var Base = global[NAME];
var C = Base;
var ADDER = IS_MAP ? 'set' : 'add';
var proto = C && C.prototype;
var O = {};
if (!DESCRIPTORS || typeof C != 'function' || !(IS_WEAK || proto.forEach && !fails(function () {
new C().entries().next();
}))) {
// create collection constructor
C = common.getConstructor(wrapper, NAME, IS_MAP, ADDER);
redefineAll(C.prototype, methods);
meta.NEED = true;
} else {
C = wrapper(function (target, iterable) {
anInstance(target, C, NAME, '_c');
target._c = new Base();
if (iterable != undefined) forOf(iterable, IS_MAP, target[ADDER], target);
});
each('add,clear,delete,forEach,get,has,set,keys,values,entries,toJSON'.split(','), function (KEY) {
var IS_ADDER = KEY == 'add' || KEY == 'set';
if (KEY in proto && !(IS_WEAK && KEY == 'clear')) hide(C.prototype, KEY, function (a, b) {
anInstance(this, C, KEY);
if (!IS_ADDER && IS_WEAK && !isObject(a)) return KEY == 'get' ? undefined : false;
var result = this._c[KEY](a === 0 ? 0 : a, b);
return IS_ADDER ? this : result;
});
});
IS_WEAK || dP(C.prototype, 'size', {
get: function () {
return this._c.size;
}
});
}
setToStringTag(C, NAME);
O[NAME] = C;
$export($export.G + $export.W + $export.F, O);
if (!IS_WEAK) common.setStrong(C, NAME, IS_MAP);
return C;
};