The Staircase problem

The following problem is from hacker rank...

Consider a staircase of size : n

Observe that its base and height are both equal to , and the image is drawn using # symbols and spaces. The last line is not preceded by any spaces.

Write a program that prints a staircase of size .

Input Format

A single integer, , denoting the size of the staircase.

Output Format

Print a staircase of size using # symbols and spaces.

Note: The last line must have spaces in it.

Sample Input

6
Sample Output

     #
    ##
   ###
  ####
 #####
######

Explanation

The staircase is right-aligned, composed of # symbols and spaces, and has a height and width of .

My solution using recursion

function createString(str, ns, n) {
    if (ns > 0) return createString(str+" ", ns-1, n-1);
    else if (n > 0 && ns === 0) return createString(str+"#", ns, n-1);
    else if (n === 0 && ns === 0) return str;
}

// Complete the staircase function below.
function staircase(n) {
   let ns = n-1;
    while (ns >= 0) {
        console.log(createString("", ns, n));
        ns--;
    }
}