New Twiddle

controllers.application\.js

import Controller from '@ember/controller';
import { map } from '@ember/object/computed';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle'
  chores = ['clean', 'write more unit tests']
  @map('chores', function(e, i) {
    return `${e.toUpperCase()}_${i+1}!`;
  })
  excitingChores;
}

file\.js

/*
import { set } from '@ember/object';
import { map } from '@ember/object/computed';

class Hamster {
  constructor(chores) {
    set(this, 'chores', chores);
  }

  @map('chores', function(chore, index) {
    return `${chore.toUpperCase()}!`;
  })
  excitingChores;
});

let hamster = new Hamster(['clean', 'write more unit tests']);

hamster.excitingChores; // ['CLEAN!', 'WRITE MORE UNIT TESTS!']
*/

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br />
<br />
Chores: <br />
{{#each chores as |i|}}
   {{i}} <br />
{{/each}} <br />
ExcitingChores: <br />
{{#each excitingChores as |i|}}
   {{i}}<br />
{{/each}}
{{outlet}}
<br />
<br />

tests.test-helper\.js

import Application from '../app';
import config from '../config/environment';
import { setApplication } from '@ember/test-helpers';
import { assign } from '@ember/polyfills';
import { start } from 'ember-qunit';

let attributes = {
  rootElement: '#test-root',
  autoboot: false
};
attributes = assign(attributes, config.APP);

let application = Application.create(attributes);
setApplication(application);

start();

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": false
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}