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25 lines
1006 B
25 lines
1006 B
'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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