順不同な非同期処理を待機して順番どおりに実行する - Qiita

const data = ['a', 'b', 'c', 'd', 'e']; const randomInt = function(min, max) { return Math.floor( Math.random() * (max + 1 - min) ) + min; }; let processing = false; const process = name => { processing = true; setTimeout(() => { console.log('process:' + name); processing = false; }, randomInt(1000, 3000)); } data.forEach((value) => { const intervalId = setInterval(() => { if (processing === true)