examples/rosettacode/letter_frequency.nit

   1 #!/usr/bin/env nit
   2 #
   3 # This file is part of NIT ( http://www.nitlanguage.org ).
   4 # This program is public domain
   5
   6 # Task: Open a text file and count the occurrences of each letter.
   7 # SEE: <http://rosettacode.org/wiki/Letter_frequency>
   8 #
   9
  10 import counter
  11
  12 var file = new FileReader.open("/etc/issue")
  13 var counter = new Counter[Char]
  14 while not file.eof do
  15         var char = file.read_char
  16         if char != null and char.is_letter then
  17                 counter.inc(char)
  18         end
  19 end
  20
  21 for char, count in counter do
  22         print "{char} => {count}"
  23 end