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28 lines
919 B
28 lines
919 B
'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 apply = require('../internals/function-apply'); |
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var anObject = require('../internals/an-object'); |
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var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy'); |
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var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise, args) { |
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var state = this; |
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var iterator = state.iterator; |
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return Promise.resolve(anObject(apply(state.next, iterator, args))).then(function (step) { |
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if (anObject(step).done) { |
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state.done = true; |
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return { done: true, value: undefined }; |
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} |
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return { done: false, value: [state.index++, step.value] }; |
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}); |
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}); |
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$({ target: 'AsyncIterator', proto: true, real: true, forced: true }, { |
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asIndexedPairs: function asIndexedPairs() { |
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return new AsyncIteratorProxy({ |
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iterator: anObject(this), |
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index: 0 |
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}); |
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} |
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});
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