README.md

charcount

Variations on Nishimotoさん's Disco challenge.

a.rb

# brutal: reads the whole file into memory

require 'pp'

pp File.read('names.txt')
  .each_char
  .inject(Hash.new(0)) { |h, c|
    c = c.downcase
    h[c] += 1 if c >= 'a' && c <= 'z'
    h }
  .sort_by { |k, v| -v }

b.rb

# only loads 1024 chars max

require 'pp'

h = Hash.new(0)

File.open('names.txt') do |f|
  loop do
    s = f.read(1024); break unless s
    s.each_char { |c|
      c = c.downcase
      h[c] += 1 if c >= 'a' && c <= 'z' }
  end
end

pp h.sort_by { |k, v| -v }

names.txt

sato amano nishida saito fujiwara matsudaira
nishimoto ishibashi takata kitadai mitsuda bussaki himura
kikuchi maru arai ishikawa
takahashi ueda