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'use strict';
var global = require('./_global')
, $export = require('./_export')
, meta = require('./_meta')
, fails = require('./_fails')
, hide = require('./_hide')
, redefineAll = require('./_redefine-all')
, forOf = require('./_for-of')
, anInstance = require('./_an-instance')
, isObject = require('./_is-object')
, setToStringTag = require('./_set-to-string-tag')
, dP = require('./_object-dp').f
, each = require('./_array-methods')(0)
, DESCRIPTORS = require('./_descriptors');
module.exports = function(NAME, wrapper, methods, common, IS_MAP, IS_WEAK){
var Base = global[NAME]
, C = Base
, ADDER = IS_MAP ? 'set' : 'add'
, proto = C && C.prototype
, 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;
});
});
if('size' in proto)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;
};
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