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

heap

Memory for data whose size or lifetime isn't fixed in advance.

The heap is memory requested from the allocator at run time and released explicitly; it holds data that grows or outlives a call.

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