emberjs/ember.js — pull request #3032 by jamesotron (2013-07-22 04:19:24+00:00)
Title: Add `Ember.computed.join` shorthand method.

`Ember.computed.join` joins the result of each dependent property into a
single string, with the supplied separator. This is analogous to
JavaScript's Array.join, which is used inside the implementation.

Example:

```javascript
person = Ember.Object.create({
firstName: 'Jean-Luc',
lastName: 'Picard',
fullName: Ember.computed.join(' ', 'firstName', 'lastName')
});
```