code: function makeArray(obj) {
        if (obj === null || obj === undefined) { return []; }
        return isArray(obj) ? obj : [obj];
      }
docs: Forces the passed object to be part of an array. If the object is already
  an array or array-like, returns the object. Otherwise adds the object to
  an array. If obj is `null` or `undefined`, returns an empty array.
  
  ```javascript
  Ember.makeArray();            // []
  Ember.makeArray(null);        // []
  Ember.makeArray(undefined);   // []
  Ember.makeArray('lindsay');   // ['lindsay']
  Ember.makeArray([1, 2, 42]);  // [1, 2, 42]
  
  var controller = Ember.ArrayProxy.create({ content: [] });
  
  Ember.makeArray(controller) === controller;  // true
  ```
  
  @method makeArray
  @for Ember
  @param {Object} obj the object
  @return {Array}