Extends Set to be ordered by a score. Sort of like a set, in that there are
no duplicates, but also sort of like an array, in that it's ordered.
Create an instance, add some objects to it, and set the scores for those objects. When you iterate or slice the instance it'll be sorted by score behind the scenes.
require 'ranking'
ranking = Ranking.new
ranking << :foo
ranking << :bar
ranking.inc(:foo, 2) # Incremente score of :foo by one
ranking.dec(:bar) # Decrement, defaults to 1
ranking.score(:baz, 3) # Set score explicitly, implicitly adds :baz to the set
ranking.to_a # => [:baz, :foo, :bar]
ranking.scores[:foo] # => 2Or, if you wanted something more useful, here's a script I wrote to see
which commands in my .bash_history are the most common:
require 'ranking'
word_freq = Ranking.new
File.open(File.expand_path("~/.bash_history")).each_line do |line|
words = line.chomp.split(" ")
words.each_index do |i|
word_freq.inc( words[0..i].join(" ") )
end
end
puts "Top 50 commands in ~/.bash_history"
puts "-------"
word_freq[0..49].each_index do |i|
word = word_freq[i]
puts "#{"%2i" % [i+1]}) #{word} (#{word_freq.scores[word]})"
endgem 'ranking'
Copyright (c) 2012 Ryan Michael
See LICENSE.txt for details.