Merge branch 'invisnet-master'

Author: sukima

chapters/arrays/shuffling-array-elements.md

@@ -79,11 +79,11 @@ The following code adds the shuffle function to the Array prototype, which means
 you are able to run it on any array you wish, in a much more direct manner.
 
 {% highlight coffeescript %}
-do -> Array::shuffle ?= ->
-  for i in [@length-1..1]
+Array::shuffle ?= ->
+  if @length > 1 then for i in [@length-1..1]
     j = Math.floor Math.random() * (i + 1)
     [@[i], @[j]] = [@[j], @[i]]
-  @
+  this
 
 [1..9].shuffle()
 # => [ 3, 1, 5, 6, 4, 8, 2, 9, 7 ]
@@ -97,8 +97,10 @@ objects you don’t own][dontown]; [Extending built-in native objects. Evil or n
 operator (`?=`). That way, we don't overwrite someone else's, or a native browser method.
 
 Also, if you think you'll be using a lot of these utility functions, consider using a
-utility library, like [Lo-dash](http://lodash.com/). They include a lot of nifty 
+utility library, like [Lo-dash](http://lodash.com/)^†. They include a lot of nifty
 features, like maps and forEach, in a cross-browser, lean, high-performance way. 
 
+^† [Underscore](http://underscorejs.org/) is also a good alternative to Lo-dash.
+
 [dontown]: http://www.nczonline.net/blog/2010/03/02/maintainable-javascript-dont-modify-objects-you-down-own/
 [extendevil]: http://perfectionkills.com/extending-built-in-native-objects-evil-or-not/