Ruby | Hash each_key function

Ruby | Hash each() function

Last Updated : 07 Jan, 2020

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

Syntax: Hash.each() Parameter: Hash values Return: calls block once for each key in hash otherwise Enumerator if no argument is passed.

Example #1 :

Ruby

# Ruby code for Hash.each() 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 form : #{a.each()}\n\n"

puts "Hash b each form : #{b.each {|key| puts "#{key}"}}\n\n"

puts "Hash c each form : #{c.each {|value| puts "#{value}"}}\n\n"

Output :

Hash a each form : #

[:a, 100]
[:c, 300]
[:b, 200]
Hash b each form : {:a=>100, :c=>300, :b=>200}

[:a, 100]
Hash c each form : {:a=>100}

Example #2 :

Ruby

# Ruby code for Hash.each() 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 form : #{a.each()}\n\n"

puts "Hash b each form : #{b.each {|key| puts "#{key}"}}\n\n"

puts "Hash c each form : #{c.each {|value| puts "#{value}"}}\n\n"

Output :

Hash a each form : #

["a", 100]
Hash b each form : {"a"=>100}

["a", 100]
["c", 300]
["b", 200]
Hash c each form : {"a"=>100, "c"=>300, "b"=>200}

Ruby | Hash each_key function

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