ENUM

components.my-component.js

import Ember from 'ember';

// Mock underscore.
let _ = {
  includes: function(val) {
    return this.indexOf(val) !== -1;
  }  
};

function enumProp(def, valid) {
  return function(key, val) {
  	if (!val) {
      return def;
    } else if (val) {
      if (typeof valid === 'function') {
        Ember.assert(`!!! Invalid value supplied for enum: ${val}.`, valid(val));   
      }
      else {
        Ember.assert(`!!! Invalid value supplied for enum: ${val}. Valid values: [${valid.join(', ')}] !!!`, valid.indexOf(val) !== -1);  
      }
    }
    return val;
  }.property();
}

export default Ember.Component.extend({
  
  type: enumProp('default', ['default', 'foo', 'bar']),
  
  thing: enumProp('apple', _.includes.bind(['apple', 'orange', 'pear'])),
  
});

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}}


{{my-component}}
{{my-component type='bar'}}
{{my-component type='wut'}}

{{my-component}}
{{my-component thing='orange'}}
{{my-component type='banana'}}
<br>
<br>

templates.components.my-component.hbs

<h6>my-component type: {{type}}, thing: {{thing}}</h6>

twiddle.json

{
  "version": "0.4.7",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.6/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.7/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.6/ember-template-compiler.js"
  }
}