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!');How does asynchronous javascript work?
const printProcess = () => {
console.log('it will print 2nd');
var currentTime = new Date().getTime();
while (currentTime + 3000 >= new Date().getTime());
console.log('it will print after added 3 second with current time')
}
console.log('it will print 1st ');
printProcess(); //follow arrow funtion after 1st print
console.log('it will print at the end');
//Expected output below:
// it will print 1st
// it will print 2nd
// it will print after added 3 second with current time
// it will print at the endCopyright © 2021 Codeinu
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