New Twiddle

components.true-false-component.js

import Ember from 'ember';
import Component from '@ember/component'

export default Component.extend({
  hello: true ,

  actions:{
      switch: function(hello){
        if(hello === false){
        this.set(hello, true);
      }else {
        if(hello === true){
          this.set(hello, false);
          console.log('local variable: ', hello)
          console.log('component property: ', this.hello)
        }  
      }
    },
      switchFixed: function(hello){
        if(hello === false){
        this.set('hello', true);
      }else {
        if(hello === true){
          this.set('hello', false);
          console.log('local variable: ', hello)
          console.log('component property: ', this.hello)
        }  
      }
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{true-false-component}}
<br>
<br>

templates.components.true-false-component.hbs

<div>
Hello's value: {{hello}}
</div>
<button {{action 'switch' hello}}>
Broken Toggle (see console log err)
</button>

<button {{action 'switchFixed' hello}}>
  Fixed Toggle
</button>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}