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33 lines
1.1 KiB
33 lines
1.1 KiB
4 years ago
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// https://github.com/tc39/proposal-iterator-helpers
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var $ = require('../internals/export');
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var path = require('../internals/path');
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var aFunction = require('../internals/a-function');
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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 createIteratorProxy = require('../internals/iterator-create-proxy');
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var getIteratorMethod = require('../internals/get-iterator-method');
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var Iterator = path.Iterator;
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var IteratorProxy = createIteratorProxy(function (arg) {
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var result = anObject(this.next.call(this.iterator, arg));
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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 }, {
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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 != null) {
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iterator = aFunction(usingIterator).call(object);
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if (iterator instanceof Iterator) return iterator;
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} else {
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iterator = object;
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} return new IteratorProxy({
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iterator: iterator
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});
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}
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});
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