for i in 0..<4{ print(i) } // 0, 1, 2, 3
for i in (0..<4).reversed(){ print(i) } // 3, 2, 1, 0
for i in stride(from:3, through:0, by: -1){ print(i) } // 3 2 1 0
let list = [1, 2, 3] for item in list{ print(item) } // 1 2 3