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Contents
module Enumerable
# Generates a hash mapping each unique symbol in the array
# to the absolute frequency it appears.
#
# [:a,:a,:b,:c,:c,:c].frequency #=> {:a=>2,:b=>1,:c=>3}
#
# CREDIT: Brian Schröder
#
#--
# NOTE: So why not use #inject here? e.g. ...
#
# inject(Hash.new(0)){|p,v| p[v]+=1; p}
#
# Because it is a fair bit slower than the traditional definition.
#++
def frequency
p = Hash.new(0); each{ |v| p[v] += 1 }; p
end
end
Version data entries
10 entries across 9 versions & 2 rubygems