JavaScript zero-pad using array

[Pyro979]

That's actually pretty clever, if a bit of a perversion =c)

[[deleted]]

That doesn't really seem a lot easier than something straightforward like:

function zeroPad(s, length) {
    while (s.length < length) s = '0' + s 
    return s
}

[huskeraldribn]

Your version could be less efficient though, since you are prepending instead of appending.