| 'use strict'; |
| var $ = require('../internals/export'); |
| var IS_PURE = require('../internals/is-pure'); |
| var getBuiltIn = require('../internals/get-built-in'); |
| var anObject = require('../internals/an-object'); |
| var aFunction = require('../internals/a-function'); |
| var speciesConstructor = require('../internals/species-constructor'); |
| var iterate = require('../internals/iterate'); |
| |
| // `Set.prototype.intersection` method |
| // https://github.com/tc39/proposal-set-methods |
| $({ target: 'Set', proto: true, real: true, forced: IS_PURE }, { |
| intersection: function intersection(iterable) { |
| var set = anObject(this); |
| var newSet = new (speciesConstructor(set, getBuiltIn('Set')))(); |
| var hasCheck = aFunction(set.has); |
| var adder = aFunction(newSet.add); |
| iterate(iterable, function (value) { |
| if (hasCheck.call(set, value)) adder.call(newSet, value); |
| }); |
| return newSet; |
| } |
| }); |