JavaScript sprintf

Return a formatted string
function sprintf ( ) {
// Return a formatted string
//
// version: 909.322
// discuss at: http://phpjs.org/functions/sprintf // + original by: Ash Searle (http://hexmen.com/blog/)
// + namespaced by: Michael White (http://getsprink.com)
// + tweaked by: Jack
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + input by: Paulo Ricardo F. Santos // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + input by: Brett Zamir (http://brett-zamir.me)
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// * example 1: sprintf("%01.2f", 123.1);
// * returns 1: 123.10 // * example 2: sprintf("[%10s]", 'monkey');
// * returns 2: '[ monkey]'
// * example 3: sprintf("[%'#10s]", 'monkey');
// * returns 3: '[####monkey]'
var regex = /%%|%(\d+\$)?([-+\'#0 ]*)(\*\d+\$|\*|\d+)?(\.(\*\d+\$|\*|\d+))?([scboxXuidfegEG])/g; var a = arguments, i = 0, format = a[i++];

// pad()
var pad = function (str, len, chr, leftJustify) {
if (!chr) {chr = ' ';} var padding = (str.length >= len) ? '' : Array(1 + len - str.length >>> 0).join(chr);
return leftJustify ? str + padding : padding + str;
};

// justify() var justify = function (value, prefix, leftJustify, minWidth, zeroPad, customPadChar) {
var diff = minWidth - value.length;
if (diff > 0) {
if (leftJustify || !zeroPad) {
value = pad(value, minWidth, customPadChar, leftJustify); } else {
value = value.slice(0, prefix.length) + pad('', diff, '0', true) + value.slice(prefix.length);
}
}
return value; };

// formatBaseX()
var formatBaseX = function (value, base, prefix, leftJustify, minWidth, precision, zeroPad) {
// Note: cas