I’ve been learning a lot of new and subtle things about the Ruby language by working through Ruby Koans. Things get a little tedious as you work through each step, having to run ruby path_to_enlightenment.rb every time you want to assess your progress.

I use the vim editor, and to speed things up a little I mapped this little command to write the file I am working with and run the above command.

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:map ,r :w\|!ruby path_to_enlightenment.rb<CR>

Nice - while working on one of the Ruby Koans, this allows me to use two quick keystrokes ‘,r’ to assess my progress.