mut examples

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    onFirst() {
      let onNewNumber = this.get('onCalculateNewNumber') || Ember.K;
      onNewNumber(Math.random() * 10);
    },
    
    onSecond() {
      let onNewPoint = this.get('onCalculateNewPoint') || Ember.K;
      onNewPoint({x: Math.random() * 10, y: Math.random() * 10});
    }
  }
});

components.parent-component.js

import Ember from 'ember';

export default Ember.Component.extend({
    newNumber :0,
  
  actions: {
  }
});

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}}
{{parent-component}}
<br>
<br>

templates.components.my-component.hbs

{{yield}}
<button {{action "onFirst"}}>New Number</button>
<button {{action "onSecond"}}>New Point</button>

templates.components.parent-component.hbs

{{yield}}
{{my-component onCalculateNewNumber=(action (mut newNumber)) onCalculateNewPoint=(action (mut newNumber) value="x")}}
<br>
New Number is : {{newNumber}}

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}