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。)