JS RightPad

function doStuff(s) {
    if (s.indexOf('.') == -1) s += '.';
    while (s.length <= s.indexOf('.') + 2) s += '0';
    return s;
}

console.log(doStuff("3"));
console.log(doStuff("3.0"));
console.log(doStuff("3.1"));
console.log(doStuff("3.00"));
console.log(doStuff("3.10"));
console.log(doStuff("3.01"));
console.log(doStuff("3.22"));
console.log(doStuff("3.224"));
console.log(doStuff("3.000"));