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editing: index.js

// TheSpanishInquisition

// Cache the matrix. Note that if you not pass a limit this implementation will use a dynamically calculate one.

module.exports = function(__this, that, limit) {

var thisLength = __this.length,
      thatLength = that.length,
      matrix = [];

// If the limit is not defined it will be calculate from this and that args.
  limit = (limit || ((thatLength > thisLength ? thatLength : thisLength)))+1;

for (var i = 0; i < limit; i++) {
    matrix[i] = [i];
    matrix[i].length = limit;
  }
  for (i = 0; i < limit; i++) {
    matrix[0][i] = i;
  }

if (Math.abs(thisLength - thatLength) > (limit || 100)){
    return prepare (limit || 100);
  }
  if (thisLength === 0){
    return prepare (thatLength);
  }
  if (thatLength === 0){
    return prepare (thisLength);
  }

// Calculate matrix.
  var j, this_i, that_j, cost, min, t;
  for (i = 1; i <= thisLength; ++i) {
    this_i = __this[i-1];

// Step 4
    for (j = 1; j <= thatLength; ++j) {
      // Check the jagged ld total so far
      if (i === j && matrix[i][j] > 4) return prepare (thisLength);

that_j = that[j-1];
      cost = (this_i === that_j) ? 0 : 1; // Step 5
      // Calculate the minimum (much faster than Math.min(...)).
      min    = matrix[i - 1][j    ] + 1; // Deletion.
      if ((t = matrix[i    ][j - 1] + 1   ) < min) min = t;   // Insertion.
      if ((t = matrix[i - 1][j - 1] + cost) < min) min = t;   // Substitution.

// Update matrix.
      matrix[i][j] = (i > 1 && j > 1 && this_i === that[j-2] && __this[i-2] === that_j && (t = matrix[i-2][j-2]+cost) < min) ? t : min; // Transposition.
    }
  }

return prepare (matrix[thisLength][thatLength]);

/**
 *
 */
  function prepare(steps) {
    var length = Math.max(thisLength, thatLength)
    var relative = length === 0
      ? 0
      : (steps / length);
    var similarity = 1 - relative
    return {
      steps: steps,
      relative: relative,
      similarity: similarity
    };
  }

};

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