Async Basics

async-basics.js

/* 
   * An async function always returns a promise.
   * Whatever value you return, it will be returned as a promise.
   * If you want to reject a promise, then you can do so by throwing an error.
*/

let getData = async (userInput) => {
    if (userInput === 1)
        return 'Yes!'
    else
        throw new Error('No! ');
};

getData(2).then((result) => {
    console.log(result);
}).catch((error) => {
    console.log(error);
});

/*
  * await can only be used inside an async function.
  * It basically takes the value received from a promise and returns it.
  * See async-await-example.js for more details.
*/