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Ruby | Hash compare_by_identity? () function

  • Last Updated : 07 Jan, 2020

compare_by_identity? () is a Hash class method which checks the comparison of the hash key with its identity and considers exact same objects as same keys

Syntax: Hash.compare_by_identity? ()

Parameter: Hash array

Return: true if hash will compare its keys by their identity
otherwise false

Example #1:






# 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"

Output :

compare_by_identity?   a : false

compare_by_identity?   b : false

compare_by_identity?   b : false

Example #2:




# 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"

Output :

compare_by_identity?   a : false

compare_by_identity?   b : false

compare_by_identity?   b : false




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