sprintf is actually the best javascript implementation of sprintf (string.format). But wait, shouldn’t it be some more .NET-like stuff in SharePoint environment? Indeed there is! (Well, not only in SP, but ASP.NET) String.format(“Hello {0}”, “world”) does exactly the same thing as on server side. Wow, it opens for many opportunities, e.g. in jQuery tmpl: String.format validates arguments, and if all is OK, it invokes another function String._toFormattedString: function String$\_toFormattedString(useLocale, args) { var result = ''; var format = args\[0\]; for (var i=0;;) { var open = format.