Promise chain example

promise-chain.js

'use strict';

new Promise((resolve, reject) => {

    //resolve after 1 sec
    setTimeout(() => {

        resolve('chain 1');
    }, 1000);
})
.then((c1) => {

    console.log(c1);
    return 'chain 2';
})
.then((c2) => {

    console.log(c2);
    return 'chain 3';
})
.then((c3) => {

    console.log(c3);
    return 'end chain';
})
.then((ec) => {

    console.log(ec);
});