array change

controllers.application.js

import Ember from 'ember';
const { Controller, computed } = Ember;

let Item = Ember.Object.extend({
  now: computed(function() {
    return new Date();
  })
});

export default Controller.extend({
  appName: 'Ember Twiddle',
  init() {
    this._super(...arguments);
    let items = [1, 2, 3, 4, 5].map((i) => {
      return Item.create({
        id: i,
        name: `Item ${i}`,
      });
    });
    this.set('items', items);
  },
  actions: {
  	splice() {
      let items = this.get('items');
      this.set('items', items.splice(1, 2));
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<ul>
{{#each items as |i|}}
  <li>{{i.id}} - {{i.name}}- {{i.now}}</li>
{{/each}}
</ul>
<br>
<button onclick={{action "splice"}}>More</button>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}