Promise.all()は本当に並列処理しているのか
⇒Promise.all()は本当に並列処理している
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main(); function main() { const p = console.log; const getTimeoutPromise = timespan_ms => { return new Promise(resolve => { setTimeout(() => { resolve("timespan_ms : " + timespan_ms); }, timespan_ms); }); }; const sub = () => { const ps = []; ps.push(getTimeoutPromise(50)); ps.push(getTimeoutPromise(40)); ps.push(getTimeoutPromise(100)); ps.push(getTimeoutPromise(30)); ps.push(getTimeoutPromise(20)); ps.push(getTimeoutPromise(10)); const start = new Date(); new Promise(resolve => { Promise.all(ps).then(results => { resolve(results); }); }).then(result => { p(result); const end = new Date(); const timelapse = end.getTime() - start.getTime(); p("timelapse : " + timelapse + "[ms]"); }); }; sub(); } |
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[ 'timespan_ms : 50', 'timespan_ms : 40', 'timespan_ms : 100', 'timespan_ms : 30', 'timespan_ms : 20', 'timespan_ms : 10' ] timelapse : 103[ms] |
