Ruby | Hash each_key function

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

# 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

# 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

Ruby | Hash each_key function

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