async function fetchJson
async function getUserAsync(name)
{
let response = await fetch(`https://api.github.com/users/${name}`);
let data = await response.json()
return data;
}
getUserAsync('yourUsernameHere')
.then(data => console.log(data));async fetch api call
async function getUserAsync(name) {
try{
let response = await fetch(`https://api.github.com/users/${name}`);
return await response.json();
}catch(err){
console.error(err);
// Handle errors here
}
}js async await
/* Notes:
1. written like synchronous code
2. compatible with try/catch blocks
3. avoids chaining .then statements
4. async functions always return a promise
5. function pauses on each await expression
6. A non promise value is converted to
Promise.resolve(value) and then resolved
*/
// Syntax
// Function Declaration
async function myFunction(){
await ... // some code goes here
}
// Arrow Declaration
const myFunction2 = async () => {
await ... // some code goes here
}
// OBJECT METHODS
const obj = {
async getName() {
return fetch('https://www.example.com');
}
}
// IN A CLASS
class Obj {
// getters and setter CANNOT be async
async getResource {
return fetch('https://www.example.com');
}
}async and await
function delayResult() {
return new Promise(resolve => {
setTimeout(() => {
resolve(‘Done’);
}, 5000)
})
}
async function getResult() {
let result = await delayResult();
return result;
}
getResult();Copyright © 2021 Codeinu
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