Javascript: Promise(ES6):

Creating a Promise :

const myFirstPromise = new Promise((resolve, reject) => {
// do something asynchronous which eventually calls either:
//
// resolve(someValue); // fulfilled
// or
// reject("failure reason"); // rejected
});
function myAsyncFunction(url) {
return new Promise((resolve, reject) => {
const xhr = new XMLHttpRequest();
xhr.open("GET", url);
xhr.onload = () => resolve(xhr.responseText);
xhr.onerror = () => reject(xhr.statusText);
xhr.send();
});
}

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