2 var each = require('./_array-methods')(0)
3 , redefine = require('./_redefine')
4 , meta = require('./_meta')
5 , assign = require('./_object-assign')
6 , weak = require('./_collection-weak')
7 , isObject = require('./_is-object')
8 , getWeak = meta.getWeak
9 , isExtensible = Object.isExtensible
10 , uncaughtFrozenStore = weak.ufstore
14 var wrapper = function(get){
15 return function WeakMap(){
16 return get(this, arguments.length > 0 ? arguments[0] : undefined);
21 // 23.3.3.3 WeakMap.prototype.get(key)
22 get: function get(key){
24 var data = getWeak(key);
25 if(data === true)return uncaughtFrozenStore(this).get(key);
26 return data ? data[this._i] : undefined;
29 // 23.3.3.5 WeakMap.prototype.set(key, value)
30 set: function set(key, value){
31 return weak.def(this, key, value);
35 // 23.3 WeakMap Objects
36 var $WeakMap = module.exports = require('./_collection')('WeakMap', wrapper, methods, weak, true, true);
38 // IE11 WeakMap frozen keys fix
39 if(new $WeakMap().set((Object.freeze || Object)(tmp), 7).get(tmp) != 7){
40 InternalMap = weak.getConstructor(wrapper);
41 assign(InternalMap.prototype, methods);
43 each(['delete', 'has', 'get', 'set'], function(key){
44 var proto = $WeakMap.prototype
45 , method = proto[key];
46 redefine(proto, key, function(a, b){
47 // store frozen objects on internal weakmap shim
48 if(isObject(a) && !isExtensible(a)){
49 if(!this._f)this._f = new InternalMap;
50 var result = this._f[key](a, b);
51 return key == 'set' ? this : result;
52 // store all the rest on native weakmap
53 } return method.call(this, a, b);