Created
May 13, 2018 09:28
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JS
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| function promiseLimit(data, promiseFncGenerator, limit) { | |
| const dataLength = data.length; | |
| let cursor = 0; | |
| function next() { | |
| if (cursor < dataLength) { | |
| return promiseFncGenerator(data[cursor++]); | |
| } | |
| return null; | |
| } | |
| const results = []; | |
| function getNextPromiseChain() { | |
| const promise = next(); | |
| if (promise) { | |
| return promise.then(res => { | |
| results.push(res); | |
| if (res) { | |
| const newPromise = getNextPromiseChain(); | |
| if (newPromise) { | |
| return newPromise; | |
| } | |
| } | |
| return null; | |
| }); | |
| } | |
| return null; | |
| } | |
| const promises = new Array(limit).fill(0).map(() => getNextPromiseChain()); | |
| return Promise.all(promises).then(() => results); | |
| } |
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