I am using the `setInterval()` function to call a function every 20 seconds. However, one thing I noticed is that it the first time `setInterval()` actually calls the function is at 20 seconds (and not when `setInterval()` is called). Here is my current workaround:

```
dothis();
var i = setInterval(dothis, 20000);

```

Is there any way to achieve this without having this duplicate code?