Enthuware

Hello. I wonder if there is a special reason for writing the type in the lambda expression. You wrote that the expression in first option was syntactically correct.

Greetings V. Ekholm

As the explanation says, the variable name in the lambda cannot be d because d is already used in the method. That is why even though syntax of the lamda in option 1 is correct but it will not compile. Data x doesn't have that problem.

Thank you, I just wonder why it says "(Data x)->" and not just "(x)->"

There is no special reason for that.