computed.sort

application.controller.js

import Ember from 'ember';

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

  items: [{pos: 1, text: '1'},{pos: 2, text: '2'},{pos: 3, text: '3'}],


  actions: {
    changePos: function(){
      var i = this.get('items').findBy('text','3');
      Ember.set(i,'pos',0);
    }
  }

});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<button {{action 'changePos'}}>Change</button>
<br>
{{outlet}}
<br>
<br>

List 1
{{list-view items=items}}
<br>
<br>
List 2
{{list-view items=items}}
<br>
<br>
List 3
{{list-view items=items}}

list-view.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  items: null,

  sortProperties: ['pos:desc'],

  sortedItems: Ember.computed.sort('items', 'sortProperties')
});

list-view.template.hbs

{{#each sortedItems as |item|}}
<p>{{item.text}}</p>
{{/each}}

twiddle.json

{
  "version": "0.4.14",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}