Mairo problem solution with javascript

mario.js

makePyramid(2);
function makePyramid(n) {
    n = n *2+2;
    r = parseInt(n/2) + 1;
    for(var i=2;i<n;i+=2) {
    // inject spaces before every hash line
    // number of spaces r = n/2 + 1
    var z = (n-i)/2+1;
    process.stdout.write(returnSpaces(z));

    for(var j=i;j>0;j--) {
        process.stdout.write("#"); 
        if(j == (i/2)+1) {
            process.stdout.write(" ");
        }
    }
    process.stdout.write("\n");
}
}

function returnSpaces(h) {
    var result = "";
    for(var i =0;i<h;i++) {
        result = result + " ";
    }
    return result;
}