What are the restrictions for method names in Ruby?

Question

For example, I found the method name bundler? in the following snippet, and don\'t know whether the ? character is a specialized keyword or just pa

Answer 1

Method names can end in !, ? or =. Underscores are allowed as well. Besides that there are several methods that look like operators (e.g. +, *, >>, []) that you can define for your own classes.