Lambda expression with a void input

Question

Ok, very silly question.

x => x * 2 

is a lambda representing the same thing as a delegate for

int Foo(x) { return x * 2; } 

But what is the lambda equivalent of

int Bar() { return 2; } 

??

Thanks a lot!

Answer 1

The nullary lambda equivalent would be () => 2.

Answer 2

That would be:

() => 2 

Example usage:

var list = new List<int>(Enumerable.Range(0, 10)); Func<int> x = () => 2; list.ForEach(i => Console.WriteLine(x() * i)); 

As requested in the comments, here's a breakdown of the above sample...

// initialize a list of integers. Enumerable.Range returns 0-9, // which is passed to the overloaded List constructor that accepts // an IEnumerable<T> var list = new List<int>(Enumerable.Range(0, 10));  // initialize an expression lambda that returns 2 Func<int> x = () => 2;  // using the List.ForEach method, iterate over the integers to write something // to the console. // Execute the expression lambda by calling x() (which returns 2) // and multiply the result by the current integer list.ForEach(i => Console.WriteLine(x() * i));  // Result: 0,2,4,6,8,10,12,14,16,18