Ruby Reference at 3:31 PM Posted by Sriram

While using Ruby for your projects, you may need some references.
These are some references that might help you in using Ruby:

• Language

General Syntax Rules

• Comments start with a sharp (#) character and go to EOL.
• Ruby programs are sequence of expressions.
• Each expression is delimited by semicolons(;) or newlines
• Backslashes at the end of line does not terminate expression.

Reserved words

alias   and     BEGIN   begin   break   case    class   def     defined
do      else    elsif   END     end     ensure  false   for     if
in      module  next    nil     not     or      redo    rescue  retry
return  self    super   then    true    undef   unless  until   when
while   yield

Type
Basic types are

numbers, strings, ranges, regexen, symbols, arrays, and hashes. Also included are files because they are used so often.

Variables

$  global_variable
@@ class_variable
@  instance_variable
[OtherClass::]CONSTANT
local_variable

• Standard Library

Ruby comes with an extensive library of classes and modules. Some are built-in, and some are part of the standard library. You can distinguish the two by the fact that the built-in classes are in fact, built-in. There are no dot-rb files for them.

Built-in Library
Class Hierarchy:

Object

• Hash
• Symbol
• IO
  • File
• Continuation
• File::Stat
• Data
• NilClass
• Exception (see tree above)
• Array
• Proc
• String

Thanks
Sriram

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