module DidYouMean::JaroWinkler - RDoc Documentation

# module DidYouMean::JaroWinkler

### Constants

THRESHOLD
WEIGHT

### Public Instance Methods

distance(str1, str2) click to toggle source

    # File lib/did_you_mean/jaro_winkler.rb, line 68
    def distance(str1, str2)
      jaro_distance = Jaro.distance(str1, str2)

      if jaro_distance > THRESHOLD
        codepoints2  = str2.codepoints
        prefix_bonus = 0

        i = 0
        str1.each_codepoint do |char1|
          char1 == codepoints2[i] && i < 4 ? prefix_bonus += 1 : break
          i += 1
        end

        jaro_distance + (prefix_bonus * WEIGHT * (1 - jaro_distance))
      else
        jaro_distance
      end
    end