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Merge pull request #288 from MarcosX/adding_variables_scope_info

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Adding explanation about variables scope and naming convention in Ruby
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Adam Bard 2013-08-31 23:10:49 -07:00
commit 13566b6ef6
1 changed files with 18 additions and 0 deletions
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@ -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.