Move Items Up and Down

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  
  init() {
    this._super(...arguments);
    this.processes = [
      {name: "1"},
      {name: "2"},
      {name: "3"},
      {name: "4"}
    ];
  },
  
  actions: {
    moveProcessUp(process) {
      let processes = this.get('processes'),
          newIndex = processes.indexOf(process) - 1;
      processes.removeObject(process);
      processes.insertAt(newIndex, process);
    },
    moveProcessDown(process) {
      let processes = this.get('processes'),
          newIndex = processes.indexOf(process) + 1;
      processes.removeObject(process);
      processes.insertAt(newIndex, process);
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<ul>
  {{#each processes as |process|}}
    <li>
    <button {{action "moveProcessUp" process}}>&#8593;</button>
    {{process.name}}
    <button {{action "moveProcessDown" process}}>&#8595;</button>
    </li>
  {{/each}}
</ul>

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "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/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}