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Ruby | Set compare_by_identity() function

  • Last Updated : 07 Jan, 2020

The compare_by_identity() is an inbuilt method in Ruby makes the set compare its elements by their identity and returns self. This method may not be supported by all subclasses of Set.

Syntax: s1.name.compare_by_identity()

Parameters: The function does not takes any parameter.

Return Value: It returns self after comparing its elements.

Example 1:






#Ruby program to illustrate the compare_by_identity() method
  
#requires the set
require "set"
  
    s1
    = Set[]
  
#Add 10 to it
      s1
      << 10
  
#Returns self after comparing internally
         puts s1.compare_by_identity()
  
             s1
      << 'a'
  
#Returns self after comparing internally
         puts s1.compare_by_identity()

Output:

Set: {10}
Set: {10, "a"}

Example 2:




#Ruby program to illustrate the clear method
  
#requires the set
require "set"
  
    s1
    = Set[]
  
#Prints s1
      puts s1
  
#Add 10 to it
          s1
      << 10
  
         puts s1
  
#Clears the set and returns self
#which is printed
             puts s1.clear

Output:

Set: {}
Set: {10}
Set: {}

Reference: https://devdocs.io/ruby~2.5/set#method-i-compare_by_identity




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