Hash#each_key() is a Hash class method which finds the nested value which calls block once for each_key key in hash by passing the key pair as parameters.
Syntax: Hash.each_key()
Parameter: Hash values
Return: calls block once for each_key key in hash with key as 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"
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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"
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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}