New Property setting test

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  init(){
    this._super(...arguments);
    this.send('defineProps');
  },
  con:Ember.computed('question',function(){
   return ['prop1 hi kumkanillam'];
  }),
  actions:{
    defineProps(){
      let a=this.get('con');
      this.set(a[0],'-');
      console.log(' thiss ',this);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{my-component }}
<br>
{{outlet}}
<br>
<br>

templates.components.my-component.hbs

{{prop1 hi kumkanillam}}
{{yield}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}