JavaScript 非同步方法鏈式呼叫

原本是巢式呼叫

let asyncCalculator = new AsyncCalculator(0);



let asyncCalculateResult =



(



await (



await (



await (



await asyncCalculator.plusAsync(1)



).minusAsync(2)



).multiplyAsync(3)



).divideAsync(4)



).calculateResult

改寫成鏈式呼叫，一目瞭然

let asyncCalculator = new AsyncCalculator(0);



let asyncCalculateResult = await asyncCalculator.plusAsync(1)



.then(c => c.minusAsync(2))



.then(c => c.multiplyAsync(3))



.then(c => c.divideAsync(4))



.then(c => c.calculateResult)

參考來源：https://es.discourse.group/t/await-postfix-operator/1244/4

(分享此用法的該名網友是位JS大師，真的學到了。)

javascript — 2022年3月11日