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Showing content from https://github.com/rubocop/rubocop/issues/12360 below:

Predicate Methods Suffix · Issue #12360 · rubocop/rubocop · GitHub

The names of predicate methods (methods that return a boolean value) should end in a question mark (i.e. Array#empty?). Methods that don't return a boolean, shouldn't end in a question mark.

https://rubystyle.guide/#bool-methods-qmark

# bad
def my_method
  x == y
end

# good
def my_method?
  x == y
end

# bad
def my_method
  return false if x == y

  true
end

# good
def my_method?
  return false if x == y

  true
end

# good
def my_method
  return false if x == y

  nil
end

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