Null safety operator for function variable in Kotlin

Question

In my Kotlin app I have nullable variable like this

private var myCallback : (() -> Unit)? = null

Is it possible to use null safety operator ? to call it? This gives me a compilation error.

myCallback?()

I found only this ugly way for a call if it is not null

 if(myCallback != null)
     myCallback!!()

Answer 1

You can call it as follows:

 myCallback?.invoke()

The () syntax on variables of function types is simply syntax sugar for the invoke() operator, which can be called using the regular safe call syntax if you expand it.