JAVASCRIPT

js then

doSomething()
.then(function(result) {
  return doSomethingElse(result);
})
.catch(failureCallback);

.then javascript

var doSome = new Promise(function(resolve, reject){
    resolve('I am doing something');
});

doSome.then(function(value){
    console.log(value);
});

then js

new Promise( (res, rej) => {
  setTimeout(() => res(1), 1000);
}).then( (res) => {
  console.log(res); // 1
  return res*2
}).then( (res) => {
  console.log(res); // 2
});

JavaScript then() method

promiseObject.then(onFulfilled, onRejected);

.then javascript

const promise2 = doSomething().then(successCallback, failureCallback);

Promise .then javascript

Promise me that you’ll go to the supermarket
  .then(you’ll make dinner with the ingredients you bought)
  .then(i’ll do the washing up)

.then function

we can only use await keyword before a function that

returns either a promise or is itself async.

Note: we can use async function or function returning
a Promise with .then()