What program is used to type ruby code? Many people use bash on Ubuntu on windows, but it only for windows 10, my computer is windows 8.1, so what program is for windows 8.1 to write ruby code?

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Any old text editor can be used to type Ruby code.

What you seem to be after is a way to run Ruby code. Ruby code is run by a Ruby interpreter. Here is a link to a package that provides an execution environment for Ruby:

RubyInstaller for Windows

You didn’t specify your end goal (like, say, developing a Rails app) so I have to assume that you just want something to execute Ruby against.