匿名メソッド => ラムダ式
MyFunction f3 = delegate(int x) { return x * 3; };
MyFunction f4 = (int x) => { return x * 3; };
MyFunction f4 = (int x) => return x * 3;
MyFunction f4 = (int x) => x * 3;
MyFunction f4 = (x) => x * 3;
MyFunction f4 = x => x * 3;