Example Waterfall + no generators

controllers.application.js

import Ember from 'ember';



const { RSVP } = Ember;



function waterfallWrapper(objectArray = [], wrappingFunction) {
  return new RSVP.Promise((resolve, reject) => {
    let index = 0;
    function promiseNext(promise) {
      //maybe do an assert that it's a promise
      promise.then((result) => {
        if (index == objectArray.length - 1) {
          return resolve(result);
        }
        index = index + 1;
        const promise = wrappingFunction.call(this, objectArray[index]);
        promiseNext(promise); 
      }).catch(reject);
    };
     
    const promise = wrappingFunction.call(this, objectArray[index]);
 	 	promiseNext(promise);   
  });
};


const vars = ['red', 'banana', 'roger'];

const requestbin = "http://requestb.in/1j3mooh1";




export default Ember.Controller.extend({
  doSomething(someData) {

  },
  
  actions: {
    startWaterfall() {
  		waterfallWrapper(vars, (someData) => {
        return new RSVP.Promise((resolve, reject) => {
          setTimeout(() => {
            this.set('display', someData);
            resolve();
          }, 500);
        });                
      });
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{display}}
<button {{action 'startWaterfall'}}>Start</button>
<br>
<br>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}