New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    console.log(this.get('item.value'));
  },
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  init() {
  	this._super(...arguments);
  	this.set('list', [1,2,3,4,5].map(x => ({ value: x })));
	},
  
  actions: {
    update() {
      this.set('list', [1,2,2,2,5].map(x => ({ value: x })));
    },
  },
});

templates.application.hbs

{{#each list as |item|}}
  {{my-component item=item}}
{{/each}}

<button {{action "update"}}>Update</button>

templates.components.my-component.hbs

{{item.value}}

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}