Обещание. Все асинхронно ждут
async function fetchABC() {
const [a, b, c] = await Promise.all([a(), b(), c()]);
}
Clever Cicada
async function fetchABC() {
const [a, b, c] = await Promise.all([a(), b(), c()]);
} let characterResponse = await fetch('http://swapi.co/api/people/2/')
let characterResponseJson = await characterResponse.json()
let films = await Promise.all(
characterResponseJson.films.map(async filmUrl => {
let filmResponse = await fetch(filmUrl)
return filmResponse.json()
})
)
console.log(films)
const runAsyncFunctions = async () => {
const users = await getUsers()
Promise.all(
users.map(async (user) => {
const userId = await getIdFromUser(user)
console.log(userId)
const capitalizedId = await capitalizeIds(userId)
console.log(capitalizedId)
})
)
console.log(users)
}// First promise returns an array after a delay
const getUsers = () => {
return new Promise((resolve, reject) => {
return setTimeout(
() => resolve([{ id: 'ranjeet' }, { id: 'adil' }, { id: 'preet' }]),
600
)
})
}
// Second promise relies on the result of first promise
const getIdFromUser = (user) => {
return new Promise((resolve, reject) => {
return setTimeout(() => resolve(user.id), 500)
})
}
// Third promise relies on the result of the second promise
const capitalizeIds = (id) => {
return new Promise((resolve, reject) => {
return setTimeout(() => resolve(id.toUpperCase()), 200)
})
}
const runAsyncFunctions = async () => {
const users = await getUsers()
Promise.all(
users.map(async (user) => {
const userId = await getIdFromUser(user)
console.log(userId)
const capitalizedId = await capitalizeIds(userId)
console.log(capitalizedId)
})
)
console.log(users)
}
runAsyncFunctions()