Javascript promise example

promise.js

// Creating a promise
let promise = new Promise (
    (resolve, reject) => {
        // Some function that takes time - in this case, retuen afer 1 sec
        setTimeout( () => {
            if ( Math.random() > .5) {
                resolve('😀');
            } else {
                reject('😡');
            }
        }, 1000);
    }
);

// Settling a promise
promise.then(
    success => console.log('success', success),
    error => console.log('Error', error)
);