how can I check for the nullability of a variable that should contain a function?

you mean check if its null and if not call it?

yea

ahhh cleva

and to call it use

myFun?.invoke()

yes

Depending on what you want, making it non nullable and supply an empty lambda

{}

for the null case might also be an option. I think it makes the code more readable in some situations.

that’s how it was

depending on the underlying implementation, something like

if(myFun != { }) myFun()

could work, but nothing prevents you from accidentally invoking it. if its nullable, the compiler enforces that you check it first

yea it’s safer with a null check

Calling an empty lambda is the same as not calling it. It doesn't do anything. You don't have to check for emptyness. Furthermore, I wouldn't check if it's equal to an empty lambda, I don't even know if performing equality checks on lambdas work the way you expect. When you are guarding it with an if, i would definitely go for the null case.