Ruby (programming language)

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Ruby
Ruby logo.svg
Paradigmmulti-paradigm: object-oriented, imperative, functional, reflective
Designed byYukihiro Matsumoto
DeveloperYukihiro Matsumoto, et al.
First appeared1995
Stable release2.6.2 / March 13, 2019; 7 months ago (2019-03-13)[1]
Typing disciplineduck, dynamic
Scopelexical, sometimes dynamic
OSCross-platform
LicenseRuby License or BSD License[2][3]
Filename extensions.rb, .rbw
Websitewww.ruby-lang.org
Major implementations
Ruby MRI, YARV, Rubinius, MagLev, JRuby, MacRuby, RubyMotion, HotRuby, IronRuby, mruby
Influenced by
Ada,[4] C++,[4] CLU,[5] Dylan,[5] Eiffel,[4] Lisp,[5] Perl,[5] Python,[5] Smalltalk[5]
Influenced
D,[6] Elixir, Falcon, Fancy,[7] Groovy, Ioke,[8] Mirah, Nu,[9] Reia, Crystal

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.[10]

Ruby on Rails (RoR) is a web application framework that is implemented using the Ruby language.[11]

Example[change | change source]

An example Hello World program in Ruby:

puts "Hello World!"

An example program in Ruby that asks for your name and then says it:

puts "What's your name?"
name = gets.chomp
puts "Ah hello there, #{name}"

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:

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

Output:

Hello, World!
Hello, World!
Hello, World!
Hello, World!
Hello, World!

References[change | change source]

  1. "Ruby 2.6.2 Released". ruby-lang.org. 2019-03-13. Retrieved 10 May 2016.
  2. COPYING in Ruby official source repository
  3. BSDL in Ruby official source repository
  4. 4.0 4.1 4.2 Cooper, Peter (2009). Beginning Ruby: From Novice to Professional. Beginning from Novice to Professional (2nd ed.). Berkeley: Apress. p. 101. ISBN 1-4302-2363-4. To a lesser extent, Python, LISP, Eiffel, Ada, and C++ have also influenced Ruby.
  5. 5.0 5.1 5.2 5.3 5.4 5.5 Bini, Ola (2007). Practical JRuby on Rails Web 2.0 Projects: Bringing Ruby on Rails to Java. Berkeley: APress. p. 3. ISBN 1-59059-881-4. It draws primarily on features from Perl, Smalltalk, Python, Lisp, Dylan, and CLU.
  6. Intro – D Programming Language 1.0 – Digital Mars
  7. Bertels, Christopher (23 February 2011). "Introduction to Fancy". Rubinius blog. Engine Yard. Retrieved 2011-07-21.
  8. Bini, Ola. "Ioke". Ioke.org. Retrieved 2011-07-21. inspired by Io, Smalltalk, Lisp and Ruby
  9. Burks, Tim. "About Nu™". Programming Nu™. Neon Design Technology, Inc. Retrieved 2011-07-21.
  10. "About ruby".
  11. https://stackoverflow.com/questions/1237372/what-is-the-difference-between-ruby-and-ruby-on-rails

Other websites[change | change source]