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March 17, 2017 18:28
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,41 @@ #!/usr/bin/env node const async = require('async') const numTasks = 10 const numParallel = 4 function doTask(i) { console.log(`${i} start`) return new Promise((resolve, reject) => { setTimeout(() => { console.log(`${i} end`) resolve(i) }, 1000) }) } async function run() { const tasks = [...Array(numTasks).keys()].map(i => { return cb => { return doTask(i) .then(res => cb(null, res)) .catch(err => cb(err)) } }) await new Promise((resolve, reject) => { async.parallelLimit(tasks, numParallel, (err, result) => { if (err != null) { reject(err) return } resolve(result) }) }) console.log('done') } run()