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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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