display + presentation

components.list-data.js

import Ember from 'ember';
import hbs from 'htmlbars-inline-precompile';

export default Ember.Component.extend({
  layout: hbs`{{yield sortedItems}}`,
  sortedItems: Ember.computed('data.@each.id', 'sort', function() {
    const sort = this.get('sort');
    const sorted = [...this.get('data')].sort((a, b) => {
    	if (sort === 'up') return a.id - b.id;
      return b.id - a.id;
    });
    console.log(sorted.map(x => x.id));
    return sorted;
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  sort: 'up',
  data: [
    { id: 1 },
    { id: 2 },
    { id: 3 },
    { id: 4 }
  ]
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<button onClick={{action (mut sort) 'up'}}>Sort Up</button>
<button onClick={{action (mut sort) 'down'}}>Sort Down</button>

<h3> A list </h3>
{{#list-data data=data sort=sort as |items| }}
    {{list-display items=items}}
{{/list-data}}
<br>

<h3> A different list with the same behavior </h3>
{{#list-data data=data sort=sort as |items| }}
	{{#each items as |x|}}
  <span>{{x.id}}</span>
  {{/each}}
{{/list-data}}
<br>

templates.components.list-display.hbs

<ul>
{{log items}}
{{#each items as |item|}}
	<li>Item: {{item.id}} </li>
{{/each}}
</ul>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}