ember-rekru

application.controller.js

import Controller from '@ember/controller';

export default Controller.extend({
	user: {
    fullName: 'Emma Watson',
  },
});

application.route.js

import Route from '@ember/routing/route';

export default Route.extend({
});

application.template.hbs

<h3>EmberFest:</h3>
{{signup-component}}

<h3>EmberCamp:</h3>
{{signup-component}}

<hr>

<p>
	<b>Controller</b><br>
  User name: {{user.fullName}}
</p>

<p>
  <b>Component</b>
  {{two-way user=user}}
</p>

components.signup-component.component.js

import Component from '@ember/component';
import { observer, get, set } from '@ember/object';

export default Component.extend({
  members: [],
  currentMember: null,
  membersAmount: 0,

  onAddedMembers: observer('members.[]', function() {
    set(this, 'membersAmount', get(this, 'members.length'));
  }),
  
  actions: {
    addMember(member) {
      get(this, 'members').pushObject(get(this, 'currentMember'));
      set(this, 'currentMember', null);
    },
    deleteMember(member) {
      get(this, 'members').removeObject(member);
    }
  }
});

components.signup-component.template.hbs

<div>
	Sign up:
	{{input type="text" value=currentMember}}
	<button {{action "addMember"}}>Add</button>
</div>

<ul>
  {{#each members as |member|}}
    <li>
      {{member}} 
      <button {{action "deleteMember" member}}>Delete</button>
    </li>
  {{/each}}
</ul>

<p>Members Amount: {{membersAmount}}</p>

components.two-way.component.js

import Component from '@ember/component';
import { alias } from '@ember/object/computed';

export default Component.extend({
	userName: alias('user.fullName'),
});

components.two-way.template.hbs

{{input value=userName}}<br>
User name: {{userName}}

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"
  }
}