2048-moveUpTry3.js

2048-moveUpTry3.js

/**
 * @param line Array Old board array
 */
const moveLineUp = (line) => { // One uniq parameter
  // Internal function to recursive
  const moveLineUpInner = (counter, lineWithoutZeros, results=[]) => {
    // now we have only a counter
    if(counter === 0) return results; // If 0, return

    if (lineWithoutZeros.length === 0) { // If all numbers different of 0 are empty
      return moveLineUpInner(counter - 1, [], [...results, 0]); // Add 0
    }

    const currentValue = lineWithoutZeros[0]; // HEAD
    if(currentValue === lineWithoutZeros[1]) {
      const total = currentValue + lineWithoutZeros[1];
      return moveLineUpInner(counter - 1, lineWithoutZeros.slice(2), [...results, total]); // Remove 2 in lineWithoutZeros, because two blocks joined in one
    }

    return moveLineUpInner(counter - 1, lineWithoutZeros.slice(1), [...results, lineWithoutZeros[0]]); // Add number and slice line and lineWithoutZeros
  };

  return moveLineUpInner(line.length, line.filter((n)=>n > 0));
};