Ages 9–14 · Grades 5–8 · Computer Science

TraceForge

The best coders can read code, not just write it — they run it in their head first. Here you read a short program, predict what it prints, then reveal and step through the real trace: watch each line light up, each variable change, and the output build up. You cannot run code you have not predicted — that is the whole game.

These programs are written in a teaching subset of the Swift language.

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