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
variant
One of the possible forms of an enum.
A variant is one alternative of an enum: unit-like, tuple-like, or struct-like.