Pipe Nth to Mut

components.my-component-child.js

import Ember from 'ember';

export default Ember.Component.extend({
  click() {
    console.log('calling this.update');
    this.clicky('foo', 'bar');
  }
});

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

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

helpers.pipeWithNth.js

import Ember from 'ember';

export function pipeWithNth([fn, n]) {
  return function() {
    return fn(arguments[n - 1]);
  }
};

export default Ember.Helper.helper(pipeWithNth);

templates.application.hbs

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

templates.components.my-component-child.hbs

I am the child - click me
{{yield}}

templates.components.my-component.hbs

I am my-component
{{myProp}}
{{my-component-child clicky=(pipeWithNth (action (mut myProp)) 2)}}
{{yield}}

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}