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 :
a = {a:100, b:nil}
b = {a:100, c:nil, b:"b"}
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 :
a = { "a" => 100, "b" => 200 }
b = {"a" => 100}
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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Last Updated :
07 Jan, 2020
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