Question

I saw some sample code like this in Javascript. Is this AJAX?

(function() {
         /*some code*/

})();

Thanks a lot!

Answer 1

Is this AJAX?

No. It’s what’s commonly referred to as an “immediately invoked function expression”, or IIFE.

(function() {
    /*some code*/
})();
//^^These parentheses cause the function to be executed

The wrapping pair of parentheses cause the construct to be an expression, rather than a declaration. That’s necessary because you can’t have an anonymous function declaration (you’d get a syntax error).

They are commonly used to introduce a new scope (producing what you may have heard referred to as a closure).