Javascript returning strange value

Question

I was testing a function out to see what happens when it's parameters are null and decided to put an else statement with it. To my surprise, it did not log the parameters that I have passed, it's logging something else entirely. Maybe someone can shed some light on this, here's the code:

function testing(o) {
    if (!o) {
        return "Sorry, looks like you need to pass an argument.."
    } else {
        return o;
    }
}

console.log(testing(02034));
//logs 1052

What's going on here?

Answer 1

In Javascript, like other languages, starting a number with 0 would indicate it's base 8 (Octal).

Thus, 02034 in base 8 = 1052 in base 10 (decimal).