I have a function which looks like this:

```
function helo(a,b){
    if(a)
    {
       //do something
    }
    if(b)
    {
       //do something
    }
}

```

Now if I want to specify which parameter has to be passed while calling helo, how do I do it in javascript, i.e

If I want to send only parameter b, how do I call the function helo?

```
helo(parameterB); 

```

Right now parameter a takes the value