Ruby Language Comparable Rectangle comparable by area
Example
Comparable is one of the most popular modules in Ruby. Its purpose is to provide with convenience comparison methods.
To use it, you have to include Comparable and define the space-ship operator (<=>):
class Rectangle
include Comparable
def initialize(a, b)
@a = a
@b = b
end
def area
@a * @b
end
def <=>(other)
area <=> other.area
end
end
r1 = Rectangle.new(1, 1)
r2 = Rectangle.new(2, 2)
r3 = Rectangle.new(3, 3)
r2 >= r1 # => true
r2.between? r1, r3 # => true
r3.between? r1, r2 # => false
