Comparable module uses the <=> operator on the class that includes it. : Comparison Operators « Language Basics « Ruby

1. Ruby
2. Language Basics
3. Comparison Operators

Comparable module uses the <=> operator on the class that includes it.

<=> returns -1 if the supplied parameter is higher than the object's value, 
            0 if they are equal, or 
            1 if the object's value is higher than the parameter.

puts 1 <=> 2
puts 1 <=> 1
puts 2 <=> 1

 

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