Basic select with `selected` template logic

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  vehicle: "toyota",
  
  vehicles: [
    {id:1, name:'ford'},
    {id:2, name:'toyota'},
    {id:3, name:'mini'}
  ]
});

helpers.eq.js

import Ember from 'ember';

export function equalHelper(params) {
  return params[0] === params[1];
}

export default Ember.Helper.helper(equalHelper);

templates.application.hbs

<h3>Basic select box with `selected` logic handled in template</h3>

<br>
<pre>
  vehicles: [
    {id:1, name:'ford'},
    {id:2, name:'toyota'},
    {id:3, name:'mini'}
  ]
</pre>
<br>

<select onchange={{action (mut vehicle) value="target.value"}}>
  {{#each vehicles key="@item" as |vehicleChoice|}}
    <option value={{vehicleChoice.name}} selected={{eq vehicle vehicleChoice.name}}>{{vehicleChoice.name}}</option>
  {{/each}}
</select> 

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {
  }
}