async awiat
const data = async () => {
const got = await fetch('https://jsonplaceholder.typicode.com/todos/1');
console.log(await got.json())
}
data();async awiat
const data = async () => {
const got = await fetch('https://jsonplaceholder.typicode.com/todos/1');
console.log(await got.json())
}
data();async await
async function showAvatar() {
// read our JSON
let response = await fetch('/article/promise-chaining/user.json');
let user = await response.json();
// read github user
let githubResponse = await fetch(`https://api.github.com/users/${user.name}`);
let githubUser = await githubResponse.json();
// show the avatar
let img = document.createElement('img');
img.src = githubUser.avatar_url;
img.className = "promise-avatar-example";
document.body.append(img);
// wait 3 seconds
await new Promise((resolve, reject) => setTimeout(resolve, 3000));
img.remove();
return githubUser;
}
showAvatar();how to make an async function
function resolveAfter2Seconds() {
return new Promise(resolve => {
setTimeout(() => {
resolve('resolved');
}, 2000);
});
}
//async function:
async function asyncCall() {
console.log('calling');
const result = await resolveAfter2Seconds();
console.log(result);
// expected output: 'resolved'
}
asyncCall();async await
async function f() {
try {
let response = await fetch('/no-user-here');
let user = await response.json();
} catch(err) {
// catches errors both in fetch and response.json
alert(err);
}
}
f();async
function resolveAfter2Seconds() {
return new Promise(resolve => {
setTimeout(() => {
resolve('resolved');
}, 2000);
});
}
async function asyncCall() {
console.log('calling');
const result = await resolveAfter2Seconds();
console.log(result);
// expected output: 'resolved'
}
asyncCall();asynchronous javascript
console.log ('Starting');
let image;
fetch('coffee.jpg').then((response) => {
console.log('It worked :)')
return response.blob();
}).then((myBlob) => {
let objectURL = URL.createObjectURL(myBlob);
image = document.createElement('img');
image.src = objectURL;
document.body.appendChild(image);
}).catch((error) => {
console.log('There has been a problem with your fetch operation: ' + error.message);
});
console.log ('All done!');Copyright © 2021 Codeinu
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