Last change
on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
994 bytes
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[6a3a178] | 1 | 'use strict';
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| 2 | // https://github.com/tc39/proposal-iterator-helpers
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| 3 | var $ = require('../internals/export');
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| 4 | var aFunction = require('../internals/a-function');
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| 5 | var anObject = require('../internals/an-object');
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| 6 | var createIteratorProxy = require('../internals/iterator-create-proxy');
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| 7 | var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
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| 8 |
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| 9 | var IteratorProxy = createIteratorProxy(function (arg) {
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| 10 | var iterator = this.iterator;
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| 11 | var filterer = this.filterer;
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| 12 | var next = this.next;
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| 13 | var result, done, value;
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| 14 | while (true) {
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| 15 | result = anObject(next.call(iterator, arg));
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| 16 | done = this.done = !!result.done;
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| 17 | if (done) return;
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| 18 | value = result.value;
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| 19 | if (callWithSafeIterationClosing(iterator, filterer, value)) return value;
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| 20 | }
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| 21 | });
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| 22 |
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| 23 | $({ target: 'Iterator', proto: true, real: true }, {
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| 24 | filter: function filter(filterer) {
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| 25 | return new IteratorProxy({
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| 26 | iterator: anObject(this),
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| 27 | filterer: aFunction(filterer)
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| 28 | });
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| 29 | }
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| 30 | });
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