#C String.format for javascript

One thing I really miss from C# when I am working in JavaScript is String.format!

I found this little code snippet floating around the internet in many forms, but this one has been working well enough for me.

if (!String.format) {
        String.format = function(format) {
            var args = Array.prototype.slice.call(arguments, 1);
            return format.replace(/{(\d+)}/g, function(match, number) { 
                return typeof args[number] != 'undefined'
                  ? args[number] 
                  : match
                ;
            });
        };
    }

if (!String.format) {

String.format = function(format) {

var args = Array.prototype.slice.call(arguments, 1);

return format.replace(/{(\d+)}/g, function(match, number) {

return typeof args[number] != 'undefined'

? args[number]

: match

;

});

};

}

Once the function is define (see above code) it is really easy to use like I am used to in C#

String.format('{0} is the amount of times I have used this function on {1}!', 7, 'this page');

1	String.format('{0} is the amount of times I have used this function on {1}!', 7, 'this page');

The out put from above will look like this:

7 is the amount of times I have used this function on this page!

I have seen people suggest modifying String’s prototype, but I like the way it looks in C#. I would rather just cut and past this little snippet than reference some external framework, unless I get it for free in jquery or angularjs.

Let me know what you think.