Install a Text Editor
You can write Ruby programs in any text editor, such as Notepad on Windows or TextEdit on OS X. Your experience will be much better with a specialized programming text editor, which can help you by automatically indenting code, coloring your code based on its syntax, and more. If you have a favorite and know how to use it, by all means use what you have. If you don’t yet have a programming editor, using Sublime Text 3 is a great option for working with Ruby and Gosu.
Sublime Text 3 is a cross-platform text editor with versions for Mac, Windows, and Linux. You can download the most recent version of Sublime Text 3 at http://www.sublimetext.com/3. When you are editing a Ruby file in Sublime Text, you can run it with Ctrl-B ...
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