C#: Recursive functions with Lambdas

Question

The below does not compile:

Func fac = n => (n <= 1) ? 1 : n * fac(n - 1);

Local variable \'fac\' migh

Answer 1

since c# 7.0 you finally can do this in one line using a local function

int fac(int n) => (n <= 1) ? 1 : n * fac(n - 1);