sample app1

components.hello-comp.js

import Ember from 'ember';

export default Ember.Component.extend({
  nameValue: 'default-value',

  actions: {
    resetName() {
      this.set('nameValue', 'default-value');
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  actions: {
    save() {
      console.log('save called');
    }
  }
});

templates.application.hbs

{{hello-comp title='Hello comp' save=save}}

templates.components.hello-comp.hbs

<h2>{{title}}</h2>

<label> Enter name </label>
{{input type='text' value=nameValue}}

<button {{action 'resetName'}}>
  Reset
</button>

<button>
  save
</button>

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"
  }
}