Create a set of stairs using hashes

hashstairs-recursive.js

// Build a function that draws a set of stairs using hashes
// that climb vertically from left to right. The bottom stairs
// should have no spaces in front of it, for example:

// This is a set of 3
//  #
// ##
//###

function hashStairs(num, spaces, notFirstRun) {
    if (!num || num <= 0) { return ''; }
    if (!spaces) { spaces = ''; };
    if (!!notFirstRun) { spaces += ' '; }
    notFirstRun = true;

    var hashString = hashStairs(num - 1, spaces, notFirstRun) + '#';

    console.log(spaces + hashString);

    return hashString;
};

console.log('Draw Stairs');
hashStairs(5);