Convert keys and values to int (to_i) for a Hash

gistfile1.rb

# convert a hash composed of strings to integers
# ex: h = {"1" => "2", "3" => "4"}
# I want {1 => 2, 3 => 4}

string_hash = {"1" => "2", "3" => "4"}
# => {"1"=>"2", "3"=>"4"}
int_hash = Hash[*string_hash.to_a.flatten.map(&:to_i)]
# => {1=>2, 3=>4}