casecmp.md

def genderize(word_m, subject, word_f = nil)
  return word_m if male?(subject)
  return word_f if word_f.present?
  word_m + 'e'
end
private
def male?(subject)
  subject.gender.casecmp('male') == 0
end

Documentation

"abcdef".casecmp("abcde")     # => 1
"aBcDeF".casecmp("abcdef")    # => 0
"abcdef".casecmp("abcdefg")   # => -1
"abcdef".casecmp("ABCDEF")    # => 0