Best Coding "playgrounds" for Ruby and JavaScript: Best Way to Learn!

Many years ago, I used to rely on debuggers a lot. Nowadays, I rely much more on “fenced debug print statements” to quickly get the information I need.

Reviews such coding playgrounds


  1. Pry console, with or without Rails
  2. RubyMine Scratch File


  1. Chrome Developer tools console (Cmd-Option-J)
  2. CodePen Babel support and great UI. The hit Cmd-Option-J to see console output.

Any other favorite REPLs for Ruby and JavaScript?

Preconfigured CodePen for Lodash

Codepen is great, I use for JS stuff too.

Thanks @treble37!