New Twiddle

controllers.application.js

import Ember from 'ember';
import { inject as service  } from '@ember/service';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  sample: service(),
  
  action: {
    searchText() {
      let name =  this.sample.getName();
  		this.set('fName', name);
    }
  }
});

sample.js

import Ember from 'ember';

export default Ember.Service.extend({
  
  getName() {
    return "sathik";
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<button {{action "searchText"}}>CLICK HERE</button>
{{fName}}
<br>
<br>
{{outlet}}
<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"
  }
}