la-cosa-nostra/source/auxils/hybridisedStringComparison.js

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var splitJaroWinklerDistance = require("./splitJaroWinklerDistance.js");
var levenshteinDistance = require("./levenshteinDistance.js");

module.exports = function(a, b, beta_1=0.8, beta_2=0.2, alpha=1.0) {

  if (beta_1 + beta_2 !== 1) {

    throw new Error("Beta1 + beta2 should equal 1");

  };

  // Split Jaro-Winkler
  var jw_dist = splitJaroWinklerDistance(a, b);

  // Hybrid of Jaro Winkler and modified Levenshtein
  a = a.toLowerCase();
  b = b.toLowerCase();

  var lev_dist = levenshteinDistance(a, b);

  var lev_metric = (lev_dist)/b.length;
  lev_metric = Math.max(0, -Math.abs(lev_metric) + 1);

  return (jw_dist * beta_1 + lev_metric * beta_2) * alpha;

};