UpKoding challenge https://www.upkoding.com/proyek/menghitung-total-huruf-dari-kalimat-18/nandhasuhendra/

string_counter.rb

def counter(string)
  {}.tap do |result|
    string.each_char { |chr| result[chr] ? result[chr] += 1 : result[chr] = 1 }
  end
end

def format_output(hash)
  hash.each do |key, total|
    puts "Huruf #{key} : #{total}"
  end
end

format_output counter('UUPpKooding')

# RESULT:
# Huruf U : 2
# Huruf P : 1
# Huruf p : 1
# Huruf K : 1
# Huruf o : 2
# Huruf d : 1
# Huruf i : 1
# Huruf n : 1
# Huruf g : 1