Now it’s the time to learn about control structures.
While loop is a powerful tool found in most ot the programming languages. If you wish, watch this video from Daniel Shiffman as an introduction.
While-loop is repeated as long as the given condition is
true. In the example below, the condition is
x < width (x is smaller than 500). When x is 500, the condition will be false and the program will move forward and execute draw-funcion again.