// ✅ Named method – complex logic
static int Factorial(int n)
{
    int result = 1;
    for (int i = 2; i <= n; i++)
        result *= i;
    return result;
}

// ✅ Named expression-bodied method – simple logic
static int Square(int x) => x * x;

// ✅ Anonymous lambda – expression-bodied
Func<int, int> addOne = x => x + 1;

// ✅ Anonymous lambda – statement-bodied
Func<int, int> addOneVerbose = x =>
{
    int y = x + 1;
    return y; // must return explicitly
};