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Ruby | Hash compare_by_identity () function
  • Last Updated : 07 Jan, 2020

Hash#compare_by_identity () is an Hash class method which compares the hash key with its identity and consider exact same objects as same keys.

Syntax: Hash.compare_by_identity ()

Parameter: Hash array

Return: compares the hash key with its identity

Example #1 :



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# Ruby code for compare_by_identity () method
  
# declaring Hash value
a = {a:100, b:nil}
  
# declaring Hash value
b = {a:100, c:nil, b:"b"}
  
# declaring Hash value
c = {a:100}
  
puts "compare_by_identity  a : #{a.compare_by_identity}\n\n"
  
puts "compare_by_identity  b : #{b.compare_by_identity}\n\n"
  
puts "compare_by_identity  b : #{c.compare_by_identity}\n\n"

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Output :

compare_by_identity  a : {:a=>100, :b=>nil}

compare_by_identity  b : {:a=>100, :c=>nil, :b=>"b"}

compare_by_identity  b : {:a=>100}

Example #2 :

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# Ruby code for compare_by_identity () method
  
# declaring Hash value
a = { "a" => 100, "b" => 200 }
  
# declaring Hash value
b = {"a" => 100}
  
# declaring Hash value
c = {"a" => 100, "c" => "c", "b" => 200}
  
puts "compare_by_identity  a : #{a.compare_by_identity}\n\n"
  
puts "compare_by_identity  b : #{b.compare_by_identity}\n\n"
  
puts "compare_by_identity  b : #{c.compare_by_identity}\n\n"

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Output :

compare_by_identity  a : {"a"=>100, "b"=>200}

compare_by_identity  b : {"a"=>100}

compare_by_identity  b : {"a"=>100, "c"=>"c", "b"=>200}

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