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30 lines
1.2 KiB
30 lines
1.2 KiB
// https://github.com/tc39/proposal-iterator-helpers |
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var $ = require('../internals/export'); |
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var apply = require('../internals/function-apply'); |
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var anObject = require('../internals/an-object'); |
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var toObject = require('../internals/to-object'); |
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var isPrototypeOf = require('../internals/object-is-prototype-of'); |
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var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype; |
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var createIteratorProxy = require('../internals/iterator-create-proxy'); |
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var getIterator = require('../internals/get-iterator'); |
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var getIteratorMethod = require('../internals/get-iterator-method'); |
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var IteratorProxy = createIteratorProxy(function (args) { |
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var result = anObject(apply(this.next, this.iterator, args)); |
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var done = this.done = !!result.done; |
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if (!done) return result.value; |
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}, true); |
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$({ target: 'Iterator', stat: true, forced: true }, { |
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from: function from(O) { |
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var object = toObject(O); |
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var usingIterator = getIteratorMethod(object); |
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var iterator; |
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if (usingIterator) { |
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iterator = getIterator(object, usingIterator); |
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if (isPrototypeOf(IteratorPrototype, iterator)) return iterator; |
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} else { |
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iterator = object; |
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} return new IteratorProxy({ iterator: iterator }); |
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} |
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});
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