ember-push-vs-pushObject

controllers.application.js

import Ember from 'ember';
import {computed} from '@ember/object';

export default Ember.Controller.extend({
  appName: 'Ember push vs pushObject',
  
  mylist: [1, 2],
  
  mylistsize: computed('mylist.[]', function(){
    return this.get('mylist').length;
  }),
  
  actions: {
    pushToMyList(){
  	  this.get('mylist').push(this.get('mylist').length + 1);
    },
    
    pushObjectToMyList(){
  	  this.get('mylist').pushObject(this.get('mylist').length + 1);
    },
  	
    clearMyList(){
  	  this.get('mylist').clear();
    }
    
  }
  
});

templates.application.hbs

<h1>{{appName}}</h1>
<br>
<button onclick={{action "pushToMyList"}}>push to mylist</button>
<button onclick={{action "pushObjectToMyList"}}>pushObject to mylist</button>
<button onclick={{action "clearMyList"}}>clear mylist</button>
<br>
<br>
mylist elements: 
[{{#each mylist as |item|}}
 {{item}}
{{/each}}]
<br>
mylist size: {{mylistsize}}
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}