async javascript
(async () => {
let response = await fetch('/article/promise-chaining/user.json');
let user = await response.json();
...
})();async javascript
(async () => {
let response = await fetch('/article/promise-chaining/user.json');
let user = await response.json();
...
})();async and await
function delayResult() {
return new Promise(resolve => {
setTimeout(() => {
resolve(‘Done’);
}, 5000)
})
}
async function getResult() {
let result = await delayResult();
return result;
}
getResult();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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