@David09 - The original flow chart that you’re referring to is more appropriate for sequential programming. Computer science has not dispensed with the flowchart it’s just been taken to a new level.
Nowadays we use what are called case diagrams that target object oriented programming. These diagrams display classes, objects, methods and how they all relate to each other. This is still in use in iterative programming. It’s not expected that programmers would just do this kind of thing in their heads.