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- #!/usr/bin/ruby
- #
- ## https://rosettacode.org/wiki/Letter_frequency#Sidef
- #
- func letter_frequency(File file) {
- file.read.chars.grep{.match(/[[:alpha:]]/)} \
- .group_by {|letter| letter.downcase} \
- .map_val {|_, val| val.len} \
- .sort_by {|_, val| -val}
- }
-
- var top = letter_frequency(File(__FILE__))
- top.each{|pair| say "#{pair[0]}: #{pair[1]}"}
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