class Range

def overlap?(other)

(1..5).overlap?(7..9) # => false
(1..5).overlap?(4..6) # => true
Compare two ranges and see if they overlap each other
Ruby 3.3+ 
def overlap?(other)
  raise TypeError unless other.is_a? Range
  self_begin = self.begin
  other_end = other.end
  other_excl = other.exclude_end?
  return false if _empty_range?(self_begin, other_end, other_excl)
  other_begin = other.begin
  self_end = self.end
  self_excl = self.exclude_end?
  return false if _empty_range?(other_begin, self_end, self_excl)
  return true if self_begin == other_begin
  return false if _empty_range?(self_begin, self_end, self_excl)
  return false if _empty_range?(other_begin, other_end, other_excl)
  true
end