New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  myRows: Ember.computed(function() {
    var rows = [];
    for (var i = 0; i< 100; i++) {
      rows.push({"row": ""+i});
    }
    return rows;
  }),
  myColumns: Ember.computed(function() {
    return [
      {name: 'title', 
       valuePath: 'row',
       width: 30}
      ];
  })
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{#ember-table as |t|}}
   {{t.head columns=myColumns}}
   {{t.body rows=myRows}}
{{/ember-table}}

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-table": "2.0.0-beta.6"
  }
}