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Ruby | Hash each_key function

  • Last Updated : 07 Jan, 2020

Hash#each_key() is a Hash class method which finds the nested value which calls block once for each_key pair in the hash by passing the key as parameters.

Syntax: Hash.each_key()

Parameter: Hash values

Return: calls block once for key_value pair in hash with key as a parameter otherwise, Enumerator if no argument is passed.

Example #1 :






# Ruby code for Hash.each_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}
  
# each Value
puts "Hash a each_key form : #{a.each_key()}\n\n"
  
puts "Hash b each_key form : #{b.each_key {|key| puts "#{key}"}}\n\n"
  
puts "Hash c each_key form : #{c.each_key {|value| puts "#{value}"}}\n\n"

Output :

Hash a each_key form : #

a
c
b
Hash b each_key form : {:a=>100, :c=>300, :b=>200}

a
Hash c each_key form : {:a=>100}

Example #2 :




# Ruby code for Hash.each_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}
  
# each Value
puts "Hash a each_key form : #{a.each_key()}\n\n"
  
puts "Hash b each_key form : #{b.each_key {|key| puts "#{key}"}}\n\n"
  
puts "Hash c each_key form : #{c.each_key {|value| puts "#{value}"}}\n\n"

Output :

Hash a each_key form : #

a
Hash b each_key form : {"a"=>100}

a
c
b
Hash c each_key form : {"a"=>100, "c"=>300, "b"=>200}




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