'use strict';

var sequenceMatcher = ({
  token,
  ascending
}) => {
  const firstChr = token.charAt(0);
  let baseGuesses;
  const startingPoints = ['a', 'A', 'z', 'Z', '0', '1', '9'];
  // lower guesses for obvious starting points
  if (startingPoints.includes(firstChr)) {
    baseGuesses = 4;
  } else if (/\d/.exec(firstChr)) {
    baseGuesses = 10; // digits
  } else {
    // could give a higher base for uppercase,
    // assigning 26 to both upper and lower sequences is more conservative.
    baseGuesses = 26;
  }
  // need to try a descending sequence in addition to every ascending sequence ->
  // 2x guesses
  if (!ascending) {
    baseGuesses *= 2;
  }
  return baseGuesses * token.length;
};

module.exports = sequenceMatcher;
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