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- '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;
- }
- });
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