No Setter Behaviors

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  a: Ember.computed(function() {
    return 0;
  }),
  
  b: Ember.computed({
    get() {
      return 0;
    }
  }),
  
  c: Ember.computed(function() {
    return 0;
  }).readOnly(),
  
  d: Ember.computed({
    get() {
      return 0;
    }
  }).readOnly(),
  
  actions: {
    increment(prop) {
      this.incrementProperty(prop);
    }
  }
});

templates.application.hbs

<button {{action 'increment' 'a'}}>
Increment A (function): {{a}}
</button>

<button {{action 'increment' 'b'}}>
Increment B (get()): {{b}}
</button>

<button {{action 'increment' 'c'}}>
Increment C (function+readOnly): {{c}}
</button>

<button {{action 'increment' 'd'}}>
Increment D (get()+readOnly): {{d}}
</button>

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}