New Class Naming Rules in Ruby

There were 26 valid characters. Now there are 1,853!

Shannon Skipper
May 3, 2018 · 2 min read

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In Ruby 2.5 and prior:

It’s been a longstanding rule in Ruby that you must use a capital ASCII letter as the first character of a Class or Module name. This limited you to just these 26 characters:

New in Ruby 2.6:

In Ruby 2.6, non-ASCII upper case characters are allowed. By my count, that makes a total of 1,853 options! Here are the 1,827 new characters that can start a Class or Module name in Ruby 2.6:

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