Ruby is an easy language to learn, but it's often necessary to look up something we've forgotten. A combination of Google plus any Ruby books we have on our shelves can help, but sometimes it's handy to refer to a simpler set of notes - such as a 'cheat sheet.' This post attempts to cover the most interesting ones.
Ruby Syntax Cheat Sheet Pdf
The idea for this initial list came from Scott Klarr's own list. Scott has been quite prolific lately in putting together lists of cheat sheets. Some of his lists are: Apache cheat sheets, MySQL cheat sheets, PHP cheat sheets, and JavaScript / AJAX cheat sheets.
- Alternative cheat: The cheat code below the Pokemon name is the alternative code in a code breaker cheat type. Note: There are codes in the list that may not work to some Ruby versions, as much as possible, use a Ruby v1.0 game. Morever, Gen 3 Pokemon may only work to select Ruby games. 001 – BULBASAUR 39E924C4 4136A9DD AD86124F 2823D8DA.
- Control structures in Ruby are expressions, and have some value. Ruby has the loop abstraction feature called iterators. Iterators are user-definable loop structure. Examples: if age = 12 then print 'adult fee ' else print 'child fee ' end gender = if foo.gender 'male' then 'male' else 'female' end Syntax: if expr then expr.
On with the Ruby cheat sheets:
Summary: This page is a printf formatting cheat sheet. I originally created this cheat sheet for my own purposes, and then thought I would share it here. A great thing about the printf formatting syntax is that the format specifiers you can use are very similar — if not identical — between different languages, including C, C, Java, Perl, PHP, Ruby, Scala, and others.
'Essential Ruby' RefCard (PDF)
Essential Ruby is a combination of a cheat sheet and a tutorial. It's six pages long, but features a mini Ruby introduction and tutorial, as well as the myriad of tables you'd expect from a cheat sheet. It's like a whole Ruby beginner's reference and tutorial in a single PDF. The only 'catch' is that you need to be a user of DZone (the 'Digg for Developers') or JavaLobby to get it, but there's a very simple signup form you can fill in if you're not.
Ruby Cheatsheet (PDF and PNG)
This cheat sheet (homepage) covers types, exceptions, expressions, variable types, operators and precedence, constants, regular expressions, predefined / special variables, arguments accepted by the Ruby interpreter, reserved words, and a large collection of Object, String, Kernel, Array, Hash, Test::Unit, File, Dir and DateTime methods. Extremely suitable for printing and/or wall chart use.
Ruby QuickRef (HTML) Toast for mac ppc.
I often use this one myself! A ridiculously comprehensive 'cheat sheet' created by Ryan Davis covering syntax rules, reserved words, regular expression terminology, class and method definitions, predefined variables and constants, control and logic expressions and formations, exceptions, the standard library, and a whole ton of useful stuff.
Ruby Reference (PDF)
More of an extremely brief reference than a truly comprehensive cheat sheet, but still useful, especially for beginners. 5 pages long, so not suitable for printing (Also available to view on the Web at Scribd.)
Cheat: Ruby Cheat Sheets on your Terminal! (Application)
Not a cheat sheet, but an application (gem install cheat) that provides cheat sheet type reference material on your terminal (from 228 source cheat sheets!) Developed by the great guys over at Err Free.
A Beginner's Notes (HTML)
A set of notes made by a beginning Ruby developer as he works his way through a Ruby manual.
Ruby Command Line Parameters Cheat Sheet (HTML)
Sql Syntax Cheat Sheet
A simplified list of the command line options offered by the Ruby interpreter.
Strftime Parameters (HTML)
A handy guide to the formatting parameters accepted by strftime. I commonly have to look these up myself!