Ruby (programming language)

Ruby
Paradigm(s)	multi-paradigm: object-oriented, imperative, functional, reflective
Appeared in	1995
Designed by	Yukihiro Matsumoto
Developer	Yukihiro Matsumoto, et al.
Typing discipline	duck, dynamic
Scope	lexical, sometimes dynamic
Major implementations	Ruby MRI, YARV, Rubinius, MagLev, JRuby, MacRuby, RubyMotion, HotRuby, IronRuby, mruby
Influenced by	Ada, C++, CLU, Dylan, Eiffel, Lisp, Perl, Python, Smalltalk
Influenced	D, Elixir, Falcon, Fancy, Groovy, Ioke, Mirah, Nu, Reia, Crystal
OS	Cross-platform
License	Ruby License or BSD License
Usual filename extensions	.rb, .rbw
Website	www.ruby-lang.org
	Ruby Programming at Wikibooks

Ruby is the name of a programming language that was created in the mid-1990s by Yukihiro "Matz" Matsumoto in Japan. Like other programming languages, such as Python, its structure (the way it works) is very similar to the English language. It has these qualities:

Terse. Short, but still easy to understand.
Dynamic. Easy to change, anytime and anywhere.
Duck typing. If you think you understand it, you probably understand it.

Many programmers like it because the creator tried to make it easy and nice to use.^[9]

Ruby on Rails (RoR) is a web application framework that is implemented using the Ruby language.^[10]

Example

An example Hello World program in Ruby: <syntaxhighlight lang="ruby"> puts "Hello World!" </syntaxhighlight> An example program in Ruby that asks for your name and then says it: <syntaxhighlight lang="ruby"> puts "What's your name?" name = gets.chomp puts "Ah hello there, #{name}" </syntaxhighlight> A function in Ruby that joins the 2 strings (or arrays/integers) into one, removes all numbers from it, capitalizes the string and then repeats it 5 times: <syntaxhighlight lang="ruby"> def somefunction(arg1, arg2) # creates a function with 2 arguments. the args can be called anything

   arg = arg1 + arg2 # this joins them into 1 string
   arg = arg.tr("1234567890","") # this replaces all the numbers with a nothing. erases them essentially.
   arg = arg.capitalize # read that out loud
   5.times do # read that out loud too
       puts arg # prints it on a new line
   end

end somefunction("h1e2l6lo7,"," W5o6r8l9d!3") # does the function </syntaxhighlight> Output: <syntaxhighlight lang="text"> Hello, World! Hello, World! Hello, World! Hello, World! Hello, World! </syntaxhighlight>