Contents

require 'forwardable'

class Ranking
  extend Forwardable

  def initialize
    @items_to_score = {}
  end

  def top(num=nil)
    if(num.is_a?(Numeric))
      sorted_items[0,num]
    else
      sorted_items
    end
  end

  def percentile(item)
    index = sorted_items.index(item)
    worse_item_count = (length - (index+1))
    worse_item_count.to_f/length
  end

  def_delegator :@items_to_score, :has_key?, :scored?
  def_delegators :@items_to_score, :[], :[]=, :length, :each, :delete

  private

  def sorted_items
    @sorted_items ||= @items_to_score.sort_by {|item, score| -score}.map {|item, score| item}
  end

end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
metric_fu-2.0.0	lib/base/ranking.rb