How to count letters in a string and display a list of letters and their number in a sentence?

Question

ruby

str = 'the quick brown fox jumps over the lazy dog'
arr = str.split(' ')

Answer 1

str
  .delete(' ')
  .split('')
  .reduce(Hash.new(0)){|acc, n| acc[n] += 1; acc}
  .each{|k, v| puts "#{k}: #{v}"}