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

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Ruby » Language Basics » 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   Related examples in the same category 1.  A Full List of Number Comparison Operators in Ruby 2.  Comparison Operators and Expressions 3.  Equality, Less Than, or Greater Than 4.  The == and eql? return true or false

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