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Showing content from https://github.com/rubocop/rubocop/issues/14255 below:

Is your feature request related to a problem? Please describe.

A new Naming/PredicateMethod cop seems quite useful 😻

I noticed one case that it potentially could catch, but didn't, at the time: the return value is calculated by a predicate. For example:

class File
  def ruby_file
    name.end_with?('.rb')
  end
end

This code doesn't trigger the cop.

Describe the solution you'd like

the method should probably be named ruby_file?
in the assumption that every predicate returns booleans, the cop can fairly confidently guess that the statement in the body returns a boolean (if it is not -- it is bad code anyway).

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