1-way checkbox

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  init(){
    this._super(...arguments);
    this.set('myValue', true);
  },
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<input type="checkbox" checked={{myValue}} onclick={{action (mut myValue) value="target.checked"}}> {{myValue}}
<br>
<br>

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-data": "3.4.2"
  }
}