Node.js - HK7

hk7.js

async function map(arr, func) {
    for (let i = 0; i < arr.length; i++)
        arr[i] = await func(arr[i])
    return arr
}

const delay = ms => new Promise(resolve => setTimeout(resolve, ms))

; (async () => {
    let arr = [1, 2, 3, 4]
    arr = await map(arr, async (ele) => {
        await delay(1000) // 等待 1 秒
        return ele * 100 // 回傳 *100 結果
    })
    console.log(arr); // 要等 4 秒才會印出
})()

output

[ 100, 200, 300, 400 ]