lists

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  people: [
    {
      name: 'jason'
    },
    {
      name: 'jesse'
    },
    {
      name: 'mom'
    },
    {
      name: 'dad'
    },
    {
      name: 'angelina'
    }
  ],
  
  selectedIndex: 0
});

helpers.eq.js

import Ember from 'ember';

export function eq(params/*, hash*/) {
  return params[0] === params[1];
}

export default Ember.Helper.helper(eq);

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

ul {
  list-style: none;
}

li {
  height: 50px;
  border: solid 1px black;
}

li + li {
  border-top: none;
}

li.selected {
  background-color: gray;
}

templates.application.hbs

sanity check

<ul>
  {{#each people as |person i|}}
  	{{#if (eq i selectedIndex)}}
      <li class="selected">{{person.name}}</li>
    {{else}}
      <li>{{person.name}}</li>
    {{/if}}
  {{/each}}
</ul>

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}