Last change
on this file since e29cc2e was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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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 createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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| 7 |
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| 8 | var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg, Promise) {
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| 9 | var state = this;
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| 10 | var mapper = state.mapper;
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| 11 |
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| 12 | return Promise.resolve(anObject(state.next.call(state.iterator, arg))).then(function (step) {
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| 13 | if (anObject(step).done) {
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| 14 | state.done = true;
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| 15 | return { done: true, value: undefined };
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| 16 | }
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| 17 | return Promise.resolve(mapper(step.value)).then(function (value) {
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| 18 | return { done: false, value: value };
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| 19 | });
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| 20 | });
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| 21 | });
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| 22 |
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| 23 | $({ target: 'AsyncIterator', proto: true, real: true }, {
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| 24 | map: function map(mapper) {
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| 25 | return new AsyncIteratorProxy({
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| 26 | iterator: anObject(this),
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| 27 | mapper: aFunction(mapper)
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| 28 | });
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| 29 | }
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| 30 | });
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