prmise-test.js

console.log('Loading function');

var Promise = require('promise');


doPromiseOne()
    .then(doPromiseTwo)
    .then(doPromiseThree);

function doPromiseOne() {
    return promiseOne().then(function(data) {
        console.log(data);
    });
}

function doPromiseTwo() {
    return promiseTwo().then(function(data) {
        console.log(data);
    });
}

function doPromiseThree() {
    return promiseThree().then(function(data) {
        console.log(data);
    });
}


function failPromise(msg) {
  throw new Error(msg);
}

function promiseOne() {
    console.log("starting promise one");
    return new Promise(function (fulfill, reject){
        setTimeout(function () {
            console.log("promise one success");
            fulfill("promise one success");
        }, 2000)
      });
}

function promiseTwo() {
    console.log("starting promise two");
    return new Promise(function (fulfill, reject){
        setTimeout(function () {
            console.log("promise two success");
            fulfill("promise two success");
        }, 2000)
      });
}

function promiseThree() {
    console.log("starting promise three");
    return new Promise(function (fulfill, reject){
        setTimeout(function () {
            console.log("promise three success");
            fulfill("promise three success");
        }, 2000)
      });
}