ember-component-function-param

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  init(){
  	this._super(...arguments);
    this.set('myValue', this.get('getValue')());
  },
  
  getValue(){
  	return "my default value";
  }
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Component Helper Twiddle',
  
  actions: {
      myCustomGetValue(){
        return "my custom value";
      }
  }
  
});

templates.application.hbs

<h1>{{appName}}</h1>
<br>
<br>

<b>Default usage of component:</b> {{my-component}}
<br>
<br>
<b>Using component helper:</b> {{component "my-component" getValue=(action "myCustomGetValue")}}
<br>
<br>
{{outlet}}
<br>
<br>

templates.components.my-component.hbs

myValue is: {{myValue}}
{{yield}}

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"
  }
}