What's two ";" mean in javascript

Question

When i read javascript file it has tow ";" sometimes,like: ``` (function($, undefined) { ;; var defaults = { .......... ``` what that meaning?

Accepted Answer

That's just a null statement (known as an "empty statement" by the ECMAScript standard). This works as well:

```
;;;;;;;;;;;;;;;;;;;;;;;;;;alert('lots of semicolons');;;;;;;;;;;;;;;;;;;
```

It doesn't mean anything.

Solution