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

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"

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"

Output :

Hash a key form : b

Hash b key form : a

Hash c key form : b

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