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();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();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
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();javscript async await explained
// Promise approach
function getJSON(){
// To make the function blocking we manually create a Promise.
return new Promise( function(resolve) {
axios.get('https://tutorialzine.com/misc/files/example.json')
.then( function(json) {
// The data from the request is available in a .then block
// We return the result using resolve.
resolve(json);
});
});
}
// Async/Await approach
// The async keyword will automatically create a new Promise and return it.
async function getJSONAsync(){
// The await keyword saves us from having to write a .then() block.
let json = await axios.get('https://tutorialzine.com/misc/files/example.json');
// The result of the GET request is available in the json variable.
// We return it just like in a regular synchronous function.
return json;
}Copyright © 2021 Codeinu
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