@each CP test

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  
  
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>

#each w/ checkboxes:
{{my-component}}

dropdown:
{{select-test}}

{{outlet}}
<br>
<br>

helpers.eq.js

import Ember from 'ember';

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

export default Ember.Helper.helper(eq);

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    toggle(checkbox, ev) {
      console.log('onChecked', checkbox, ev);
      
      checkbox.set('checked', !checkbox.get('checked'));
    },
    submit() {
      console.log('submit', this.get('checked'));
    }
  },
  
  checkboxes: [
    Ember.Object.create({name: 'Checkbox1', checked: true}),
    Ember.Object.create({name: 'Checkbox2', checked: false}),
  ],
  
  checked: Ember.computed('checkboxes.@each.checked', function() {
    console.log('recompute');
    return this.get('checkboxes').map((checkbox) => {
      return checkbox.checked;
    });
  })
});

my-component.template.hbs

{{#each checkboxes as |checkbox|}}
  <label>
    <input type="checkbox" checked={{checkbox.checked}} {{action 'toggle' checkbox target.value on="click"}}>{{checkbox.name}} 
  </label>
{{/each}}
<br>
<input type="button" value="Submit" onClick={{action 'submit'}}>

<br>
<br>

Result:
{{!#each checked as |state|}}
  {{!state}}
{{!/each}}

{{yield}}

select-test.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  vehicles: [
    'Car 1',
    'Car 2',
    'Car 3'
   ]
});

select-test.template.hbs

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

{{yield}}

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "beta",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "beta"
  }
}