def letter_frequency(str) frequency = Hash.new(0) str.downcase.each_char do |char| if ('a'..'z').include?(char) frequency[char] += 1 end end frequency end # Test the method puts letter_frequency("Hello, World!")
def letter_frequency(str) frequency = Hash.new(0) str.downcase.each_char do |char| if ('a'..'z').include?(char) frequency[char] += 1 end end frequency end # Test the method puts letter_frequency("Hello, World!")