> However: Is it nice to manage an array of Particle objects with .x .y .vx and .vy, and some nifty methods to get and set those? Instead of writing that code t

> However: Is it nice to manage an array of Particle objects with .x .y .vx and .vy, and some nifty methods to get and set those? Instead of writing that code to crunch through the same data on a flat 1-D array of all particles? Yeah. That's the point of OO. You don’t need OO for that. Procedural languages have structures and procedures. Functional languages have records and functions.