text: // You should implement your task here.
  
  module.exports = function towelSort (matrix) {
    if (matrix == undefined || matrix.length == 0)
        return [];
    let array = [];
    for (let i = 0; i < matrix.length; i++) {
        if (i % 2 == 0) {
            for (let j = 0; j < matrix[i].length; j++) {
                array.push(matrix[i][j]);
            }
        } else {
            for (let j = matrix[i].length - 1; j >= 0; j--) {
                array.push(matrix[i][j])
            }
        }
    }
  
    return array;
  }
  