Ember.computed.reverse
A computed property macro for ember.js that returns a reversed array without allocating a new array on each replace action.
Usage
AppTimeline = EmberObject; var timeline = AppTimeline;timeline; // ['making dinner', 'grabbing lunch', 'good morning']
Why?
Simply using a computed property with toArray().reverse() will recreate a new array every time an item is added/removed from the array. With a large array of items, or complex DOM representation of these items, re-rendering becomes expensive. This leverages reduce computed arrays to perform replace actions one at a time.
Example
You can see the benefits in this example