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31 lines
994 B
31 lines
994 B
3 years ago
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'use strict';
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// https://github.com/tc39/proposal-iterator-helpers
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var $ = require('../internals/export');
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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 createIteratorProxy = require('../internals/iterator-create-proxy');
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var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
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var IteratorProxy = createIteratorProxy(function (arg) {
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var iterator = this.iterator;
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var filterer = this.filterer;
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var next = this.next;
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var result, done, value;
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while (true) {
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result = anObject(next.call(iterator, arg));
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done = this.done = !!result.done;
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if (done) return;
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value = result.value;
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if (callWithSafeIterationClosing(iterator, filterer, value)) return value;
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}
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});
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$({ target: 'Iterator', proto: true, real: true }, {
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filter: function filter(filterer) {
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return new IteratorProxy({
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iterator: anObject(this),
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filterer: aFunction(filterer)
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});
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}
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});
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