simple example for ruby pattern matching

pattern_matching.rb

def beach(*temperature)
  case temperature
  in :celcius | :c, (20..45)
    :favorable
  in :kelvin | :k, (293..318)
    :scientifically_favorable
  in :fahrenheit | :f, (68..113)
    :favorable_in_us
  else
    :avoid_beach
  end
end

beach(:c, 40)  # :favorable
beach(:k, 300) # :scientifically_favorable
beach(300)     # :avoid_beach