Merge branch 'master' of https://github.com/adambard/learnxinyminutes-docs into master-cn

1 files changed, 13 insertions, 0 deletions

diff --git a/ruby.html.markdown b/ruby.html.markdown
index 38d060a3..a3bcbbd5 100644
--- a/ruby.html.markdown
+++ b/ruby.html.markdown
@@ -4,6 +4,7 @@ filename: learnruby.rb
 contributors:
   - ["David Underwood", "http://theflyingdeveloper.com"]
   - ["Joel Walden", "http://joelwalden.net"]
+  - ["Luke Holder", "http://twitter.com/lukeholder"]
 ---
 
 ```ruby
@@ -30,6 +31,11 @@ You shouldn't either
 10 * 2 #=> 20
 35 / 5 #=> 7
 
+# Arithmetic is just syntactic sugar
+# for calling a method on an object
+1.+(3) #=> 4
+10.* 5 #=> 50 
+
 # Special values are objects
 nil # Nothing to see here
 true # truth
@@ -121,6 +127,12 @@ array = [1, "hello", false] #=> => [1, "hello", false]
 array[0] #=> 1
 array[12] #=> nil
 
+# Like arithmetic, [var] access
+# is just syntactic sugar
+# for calling a method [] on an object
+array.[] 0 #=> 1
+array.[] 12 #=> nil
+
 # From the end
 array[-1] #=> 5
 
@@ -312,4 +324,5 @@ dwight.name #=> "Dwight K. Schrute"
 
 # Call the class method
 Human.say("Hi") #=> "Hi"
+
 ```