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42 lines
1.3 KiB
42 lines
1.3 KiB
'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 toPositiveInteger = require('../internals/to-positive-integer'); |
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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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return new Promise(function (resolve, reject) { |
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var loop = function () { |
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try { |
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Promise.resolve( |
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anObject(apply(state.next, state.iterator, state.remaining ? [] : args)) |
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).then(function (step) { |
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try { |
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if (anObject(step).done) { |
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state.done = true; |
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resolve({ done: true, value: undefined }); |
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} else if (state.remaining) { |
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state.remaining--; |
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loop(); |
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} else resolve({ done: false, value: step.value }); |
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} catch (err) { reject(err); } |
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}, reject); |
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} catch (error) { reject(error); } |
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}; |
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loop(); |
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}); |
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}); |
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$({ target: 'AsyncIterator', proto: true, real: true, forced: true }, { |
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drop: function drop(limit) { |
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return new AsyncIteratorProxy({ |
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iterator: anObject(this), |
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remaining: toPositiveInteger(limit) |
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}); |
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} |
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});
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