In the previous post I wrote about how to compare objects in Javascript. In Ruby we can do the same using the Comparable module. We include the comparable module in our class and we define a pseudooperator-method <=>. Let’s say we have again a Car class that looks like this:
class Car attr :speed def initialize(speed) @speed = speed end end And now let’s make their instances comparable by including the Comparable module and defining the <=> pseudooperator.
class Car include Comparable attr :speed def <=>(other) self.speed <=> other.speed end def initialize(speed) @speed = speed end end car1 = Car.new(100) car2 = Car.new(120) car3 = Car.new(90) p car2 > car1 # true p car3 > car2 # false cars = [car1, car2, car3] p cars.sort() # [#<Car:0x000055aec8add4b0 @speed=90>, #<Car:0x000055aec8add500 @speed=100>, #<Car:0x000055aec8add4d8 @speed=120>] 
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