Crystal (programming language)

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Crystal is a general-purpose, object-oriented programming language designed and developed by Ary Borenszweig and Juan Wajnerman. Crystal is developed as open source and its syntax is inspired by Ruby. Crystal is statically type-checked but without having to specify the type of variables or method arguments. Its first official release was released in June 2014.[1][2] While the original Crystal compiler was written in Ruby, in 2013 a new compiler written using the Crystal programming language itself was released.[3] The current release version is 0.11.1 and the language is still in an experimental phase of development.

Examples

This is the simplest way to write the Hello World program in Crystal:

puts "Hello World!"

Or using an object-oriented programming style:

class Greeter
  def initialize(name)
    @name = name.capitalize
  end

  def salute
    puts "Hello #{@name}!"
  end
end

g = Greeter.new("world")
g.salute

References