JavaScript function that pads the left side of a string/number with a specific prefix, up to a specific length

string-pad.js

var PadText = (function () {
    "use strict";

    var func;

    func = function (text, prefix, finalLength) {
        return (new Array(finalLength).join(prefix.charAt(0)) + text).slice(-finalLength);
    };

    return func;
}());