code: function getWithLength(length) {
    var arrays = pool[length];
    var array;
    var i;
  
    // Create the first array for the specified length
    if (!arrays) {
      array = create(length);
    }
  
    // Find an unused array among the created arrays for the specified length
    if (!array) {
      for (i = arrays.length; i--;) {
        if (!arrays[i].inUse) {
          array = arrays[i];
          break;
        }
      }
  
      // If no array was found, create a new one
      if (!array) {
        array = create(length);
      }
    }
  
    array.inUse = true;
    return array;
  }
docs: Get an array with the specified length from the pool.
  
  @param {number} length The preferred length of the array.
  
  @return {Array} An array.