const steps = (n, direction = 'asc') => {

  let char = '#';

  let gap = n*2-1;

  for (let i = 1; i <= n; i++) {

    if (direction === 'asc') {

      // Ascending

      console.log(' '.repeat(n-i)+char.repeat(i)+' '+char.repeat(i)+' '.repeat(n-i));

    } else if (direction === 'desc') {

      // Descending

      console.log(char.repeat(i)+' '.repeat(gap)+char.repeat(i));

      gap = gap - 2;

    }

  }

}

​

console.log(steps(10, 'desc'));