| '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 getIterator = require('../internals/get-iterator'); |
| var iterate = require('../internals/iterate'); |
| |
| // `Set.prototype.isSubsetOf` method |
| // https://tc39.github.io/proposal-set-methods/#Set.prototype.isSubsetOf |
| $({ target: 'Set', proto: true, real: true, forced: IS_PURE }, { |
| isSubsetOf: function isSubsetOf(iterable) { |
| var iterator = getIterator(this); |
| var otherSet = anObject(iterable); |
| var hasCheck = otherSet.has; |
| if (typeof hasCheck != 'function') { |
| otherSet = new (getBuiltIn('Set'))(iterable); |
| hasCheck = aFunction(otherSet.has); |
| } |
| return !iterate(iterator, function (value) { |
| if (hasCheck.call(otherSet, value) === false) return iterate.stop(); |
| }, undefined, false, true).stopped; |
| } |
| }); |