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authorMarcos Brizeno <marcos.uece.comp@gmail.com>2013-08-30 21:58:23 -0300
committerMarcos Brizeno <marcos.uece.comp@gmail.com>2013-08-30 21:58:23 -0300
commite13b5111d569903c6620d448f0703707ed1dc8e8 (patch)
treea151937e8176a1966c2b66d579b0161674ea6463 /ruby.html.markdown
parent4dd948ccd297290414eecc6038277e97750c5f5e (diff)
Adding explanation about variables scope and naming
Diffstat (limited to 'ruby.html.markdown')
-rw-r--r--ruby.html.markdown18
1 files changed, 18 insertions, 0 deletions
diff --git a/ruby.html.markdown b/ruby.html.markdown
index 3a233d98..80682682 100644
--- a/ruby.html.markdown
+++ b/ruby.html.markdown
@@ -7,6 +7,7 @@ contributors:
- ["Luke Holder", "http://twitter.com/lukeholder"]
- ["Tristan Hume", "http://thume.ca/"]
- ["Nick LaMuro", "https://github.com/NickLaMuro"]
+ - ["Marcos Brizeno", "http://www.about.me/marcosbrizeno"]
---
```ruby
@@ -339,6 +340,23 @@ dwight.name #=> "Dwight K. Schrute"
# Call the class method
Human.say("Hi") #=> "Hi"
+# Variable's scopes are defined by the way we name them.
+# Variables that start with $ have global scope
+$var = "I'm a global var"
+defined? $var #=> "global-variable"
+
+# Variables that start with @ have instance scope
+@var = "I'm an instance var"
+defined? @var #=> "instance-variable"
+
+# Variables that start with @@ have class scope
+@@var = "I'm a class var"
+defined? @@var #=> "class variable"
+
+# Variables that start with a capital letter are constants
+Var = "I'm a constant"
+defined? Var #=> "constant"
+
# Class also is object in ruby. So class can have instance variables.
# Class variable is shared among the class and all of its descendants.