Online Ruby Compiler — Run Ruby Code Online Free

Ruby is famous for reading almost like English, which makes it a lovely first language — and it still powers Rails apps everywhere. You can start writing it immediately with the online Ruby compiler in GoCode, no install required.

Hello, World in Ruby

puts "Hello, World!"

Select Ruby in the IDE, paste this one line, and Run.

Reading input

n = gets.to_i
puts n * n

Enter a number in the stdin box and Run to see it squared. That's the whole program — Ruby keeps the ceremony low.

Ideas to explore

• Blocks and iterators: [1, 2, 3].each { |x| puts x }.
• Arrays and hashes.
• String methods like reverse, upcase and split.

Ruby rewards experimentation. Open the IDE and try a few lines.