Ruby Docs

Ruby cheat sheet. Quick links to Ruby documentation on the web.

ruby-lang.org

Ruby-doc

• Array
• Enumerable
• File
• Hash
• IO
• Math
• Numeric
• Range
• String

List operations

• map = map/collect or map!/collect!
• filter = select, reject, find_all, partition
• reduce = inject

Test membership in an Array

Does the array contain the element?

my_array.include?('element')

Ruby on Rails

rails v2.3.8 API documentation

rails current version API documentation

Ruby QuickRef

Pickaxe book

• syntax
• built-in classes and methods
  • Array
  • String

21 Ruby Tricks You Should Be Using In Your Own Code

Also see Ruby quirks and What is a Ruby code block?

Rubular - regex tester