Curriculum Memory defer and errdefer
defer and errdefer
defer is Zig's structural cleanup tool: each defer statement runs when the enclosing block exits, in LIFO order. errdefer is the same idea, but it only fires when the function returns via an error path. The canonical pattern is alloc-then-defer-free (always run cleanup) or alloc-then-errdefer-free (only on the error path, so successful returns hand ownership to the caller). Once these two land in your fingertips, manual memory management stops being scary.
9 ready
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pick one TypeScript reaches for try { ... } finally { ... } for
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pick one Multiple defer statements in the same block run in REVERSE
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pick one errdefer is defer's twin — same shape, but only fires
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fill blanksFill the missing keyword. The line schedules a cleanup that
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fill blanks Fill the missing keyword. Same as defer, but fires ONLY
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type one lineType the missing Zig line — schedule the buffer's release so
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type one lineType the missing Zig line — schedule cleanup that runs ONLY
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write a program Write a complete Zig program that demonstrates defer's
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write a programWrite a complete Zig program that: