HowTo override and substitute document.write function in JavaScript (sample)

It is pretty simple to wrap document.write function in JavaScript.

For example - using closures:

<script id="source" type="text/javascript">
    function wrapString(str) {
        return "(" + str + ")";
    }
    
    document.write = function(w) {
        return function(s) {
            w.call(this, wrapString(s));
        }
    }(document.write);

    document.write("Hello");
    document.write("world");
</script>

This "advanced piece of engineering" prints string: (Hello)(world)

How do you like it?