Question about " function myfunction():Void { "

1

I am still delving into AS, and there are a few concepts that still confuse me a little bit.

I looked up what “void” meant in the Adobe Flash AS dictionary. I understand that when an expression is wrapped in the void function, it marks it as undefined.

However, while dissecting this one flash file, I noticed a function written out in this syntax:


function functionName(v:Boolean):Void {
    //function instructions here
}

Now, I know that the “v:Boolean” part is basically taking the value and giving a Boolean datatype. I am a little confused about the usage of the :Void afterwards. What is the point of this syntax?

Thanks,

Jen