Ruby | Hash key() function

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 :

filter_none

edit
close

play_arrow

link
brightness_4
code

# 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"

chevron_right


Output :

Hash a key form : b

Hash b key form : a

Hash c key form : 

Example #2 :

filter_none

edit
close

play_arrow

link
brightness_4
code

# 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"

chevron_right


Output :

Hash a key form : b

Hash b key form : a

Hash c key form : b



My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.