Ruby | Comparable Module (original) (raw)

Last Updated : 10 Oct, 2018

In Ruby, the mixin of Comparable is used by the class whose objects may be ordered. The class must be defined using an operator which compare the receiver against another object. It will return -1, 0, and 1 depending upon the receiver. If the receiver is less than another object, then it returns -1, if the receiver is equal to another object, then it returns 0. If the receiver is greater than another object, then it returns 1. Comparable module use <=> to implement the conventional comparison operators(<, <=, ==, >=, and >) and the method between? Example:

Ruby `

Ruby program to illustrate

comparable module

class Geeksforgeeks

include comparable module

include Comparable attr :name

def <=>(other_name)
    name.length <=> other_name.name.length
end

def initialize(name)
    @name = name
end

end

creating objects

a1 = Geeksforgeeks.new("G") a2 = Geeksforgeeks.new([3, 5]) a3 = Geeksforgeeks.new("geeks")

using comparable operator

p a1 < a2

using between? method

p a2.between?(a1, a3) p a3.between?(a1, a2)

`

Output:

true true false

Instance Method

Ruby program to illustrate

use of comparisons

defining class

class Geeksforgeeks

include comparable module

include Comparable attr :name

def <=>(other_name)
    name.length <=> other_name.name.length
end

def initialize(name)
    @name = name
end

end

creating objects

a1 = Geeksforgeeks.new("G") a2 = Geeksforgeeks.new("geeks")

using < operator

p a1 < a2

using <= operator

p a1 <= a2

using == operator

p a1 == a2

using >= operator

p a1 >= a2

using > operator

p a1 > a2

` Output:

true true false false false

Ruby program to illustrate

use of between? method

using between? method

p 7.between?(2, 6)
p 'geeks'.between?('geeks', 'gfg')
` Output:
false
true

Reference: https://ruby-doc.org/core-2.2.0/Comparable.html

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