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// async & await

// clear style of using promise :)

// 1. async

async function fetchUser() {

// do network reqeust in 10 secs....

return 'ellie';

}

const user = fetchUser();

user.then(console.log);

console.log(user);

// 2. await ✨

function delay(ms) {

return new Promise(resolve => setTimeout(resolve, ms));

}

async function getApple() {

await delay(2000);

return '🍎';

}

async function getBanana() {

await delay(1000);

return '🍌';

}

async function pickFruits() {

const applePromise = getApple();

const bananaPromise = getBanana();

const apple = await applePromise;

const banana = await bananaPromise;

return `${apple} + ${banana}`;

}

pickFruits().then(console.log);

// 3. useful APIs ✨

function pickAllFruits() {

return Promise.all([getApple(), getBanana()]).then(fruits =>

fruits.join(' + ')

);

}

pickAllFruits().then(console.log);

function pickOnlyOne() {

return Promise.race([getApple(), getBanana()]);

}

pickOnlyOne().then(console.log);