JavaScriptのPromiseとasync/awaitの比較

promise_async_await.js

'use strict'

const sleep = (someFunction) => {
    setTimeout(someFunction, 5000)
}

// Promise
const promiseFunction = (() => {
    return new Promise((resolve, reject) => {
        sleep(() => {
            resolve(console.log('Promise'))
        })
    })
})

// async/await
const asyncAwaitFunction = async () => {
    await sleep(() => {
        console.log('async/await')
    })
}

const meetUp = () => {
    promiseFunction().then(async () => {
        await asyncAwaitFunction()
    })
}

meetUp()

// Promise     <- 5 seconds later.
// async/await <- 10(5) seconds later.