New Twiddle

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

l.component\.js

import Component from '@glimmer/component';

export default class extends Component {
}

l.template\.hbs

In l
<ul>
  {{#each @people as |person|}}
    <li>{{person}}</li>
  {{/each}}
</ul>

m.component\.js

import Component from '@glimmer/component';

export default class extends Component {
}

m.template\.hbs

Hello, {{@person.firstName}} {{@person.lastName}}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
{{#let "Test" as |myOtherPerson|}}
  New Name: {{myOtherPerson}}
  <br />
<L
  @people={{array
    'Tom Dale'
    'Yehuda Katz'
    myOtherPerson
  }}
/>
{{/let}}
<M @person={{hash firstName='Jen' lastName='Weber'}}
/>

Hello, {{@person.firstName}} {{@person.lastName}}

{{outlet}}
{{!--! {{#let {{array 'V1' 'V2' 'V3'}} as |v1|}} {{/let}!--}}
<br>
<br>

twiddle\.json

{
  "version": "0.17.0",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}