25 lines
1,006 B
JavaScript
25 lines
1,006 B
JavaScript
'use strict';
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var $ = require('../internals/export');
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var IS_PURE = require('../internals/is-pure');
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var getBuiltIn = require('../internals/get-built-in');
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var anObject = require('../internals/an-object');
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var aFunction = require('../internals/a-function');
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var getIterator = require('../internals/get-iterator');
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var iterate = require('../internals/iterate');
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// `Set.prototype.isSubsetOf` method
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// https://tc39.github.io/proposal-set-methods/#Set.prototype.isSubsetOf
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$({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
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isSubsetOf: function isSubsetOf(iterable) {
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var iterator = getIterator(this);
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var otherSet = anObject(iterable);
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var hasCheck = otherSet.has;
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if (typeof hasCheck != 'function') {
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otherSet = new (getBuiltIn('Set'))(iterable);
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hasCheck = aFunction(otherSet.has);
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}
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return !iterate(iterator, function (value) {
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if (hasCheck.call(otherSet, value) === false) return iterate.stop();
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}, undefined, false, true).stopped;
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}
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});
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