Return type of an anonymous function

Question

I am reading about dart and one think that confuses me is the the syntax for anonymous functions. Specifically, how do I specify the type of the returned value for such a function.

For example, consider the following:

var f = (int x) {return x + 1;}; 

In this instance, I am declaring that the type of the parameter x is int. How can I explicitly say that the function returns an int? I understand that the compiler will probably figure that out using type inference, but I want to explicitly specify the type to prevent the possibility of returning a value of the wrong type when writing more complex functions.

Answer 1

You can do something like this:

int Function(int x) f = (int x) {return 1 + x;}; String Function(String x, String y) concatenate = (String x, String y) {return '$x$y';}; 

EDIT: Here is a simpler way using type casting:

int f = (int x) {return x + 1;} as int;