Hash#key() is a Hash class method which gives the key value corresponding to the value. If value doesn’t exist then return nil.
Syntax: Hash.key()
Parameter: Hash values
Return: key corresponding to the value
nil – If value doesn’t exist
Example #1 :
# Ruby code for Hash.key() method # declaring Hash value a = {a: 100 , b: 200 }
# declaring Hash value b = {a: 100 , c: 300 , b: 200 }
# declaring Hash value c = {a: 100 }
# key Value puts "Hash a key form : #{a.key(200)}\n\n"
puts "Hash b key form : #{b.key(100)}\n\n"
puts "Hash c key form : #{c.key(200)}\n\n"
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Output :
Hash a key form : b Hash b key form : a Hash c key form :
Example #2 :
# Ruby code for Hash.key() method # declaring Hash value a = { "a" => 100 , "b" => 200 }
# declaring Hash value b = { "a" => 100 }
# declaring Hash value c = { "a" => 100 , "c" => 300 , "b" => 200 }
# key Value puts "Hash a key form : #{a.key(200)}\n\n"
puts "Hash b key form : #{b.key(100)}\n\n"
puts "Hash c key form : #{c.key(200)}\n\n"
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Output :
Hash a key form : b Hash b key form : a Hash c key form : b