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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

unwinding

Abandoning stack frames one by one as an exception propagates, running finally blocks on the way.

Each frame without a matching catch is popped without returning a value; unwinding stops at the first frame whose catch clause matches.

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