New Twiddle

controllers.application.js

import Ember from 'ember';
import {computed} from '@ember/object';
export default Ember.Controller.extend({
  init(){
    this._super(...arguments);
    this.set('placeholder', "type here");
  },
  appName: 'Ember Twiddle',
  passwordsMatch: computed('password', 'passwordConfirm', function(){
     return this.get('password') === this.get('passwordConfirm'); 
  }),
  updatePasswordsMatch2(){
      this.set('passwordsMatch2', this.get('password2') === this.get('passwordConfirm2'));   
  },
  updatePasswordsMatch3(){
      this.set('passwordsMatch3', this.get('password3') === this.get('passwordConfirm3'));   
  },
  actions: {
     setPassword2(val){
       this.set('password2', val);
       this.updatePasswordsMatch2();
     },
    setPasswordConfirm2(val){
      debugger;
      this.set('passwordConfirm2', val);
      this.updatePasswordsMatch2();
    },
    setPassword3(val){
       this.set('password3', val);
       this.updatePasswordsMatch3();
     },
    setPasswordConfirm3(val){
      this.set('passwordConfirm3', val);
      this.updatePasswordsMatch3();
    }
  }
});

templates.application.hbs

<h1>Classic 2way binding + Computed properties</h1>
{{password}}
<label>Password1</label>{{input value=(mut password)}}
<br>
<label>Password Confirm</label>{{input value=(mut passwordConfirm)}}
<br>
<label>Passwords match: {{passwordsMatch}}</label>
<br>
<br>

<h1>One way input with actions as the user types</h1>
<label>Password1</label><input value={{password2}} oninput={{action 'setPassword2' value="target.value"}} />
<br>
<label>Password Confirm</label><input value={{passwordConfirm2}} oninput={{action 'setPasswordConfirm2'}} value="target.value" placeholder={{placeholder}} />
<br>
<label>Passwords match: {{passwordsMatch2}}</label>
<br>
<br>
<h1>One way input with actions when form field loses focus</h1>
<label>Password1</label><input value={{password3}} onchange={{action 'setPassword3' value="target.value"}} />
<br>
<label>Password Confirm</label><input value={{passwordConfirm3}} onchange={{action 'setPasswordConfirm3' value="target.value"}} />
<br>
<label>Passwords match: {{passwordsMatch3}}</label>

tests.helpers.destroy-app.js

import { run } from '@ember/runloop';

export default function destroyApp(application) {
  run(application, 'destroy');
}

tests.helpers.start-app.js

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

const { run } = Ember;
const assign = Ember.assign || Ember.merge;

export default function startApp(attrs) {
  let application;

  let attributes = assign({rootElement: "#test-root"}, config.APP);
  attributes.autoboot = true;
  attributes = assign(attributes, attrs); // use defaults, but you can override;

  run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.test-helper.js

import Application from '../app';
import config from '../config/environment';
import { setApplication } from '@ember/test-helpers';
import { start } from 'ember-qunit';
import { assign } from '@ember/polyfills';

let attributes = assign({ rootElement: '#main' }, config.APP);
setApplication(Application.create(attributes));

start();

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}