Closures and defer — Capture, Escape, and Compiler Transforms
Understand closure allocation mechanics, defer's cost model, and when open-coded defer eliminates overhead.
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What this chapter teaches
defer is slow; avoid it in hot paths" and "closures are just functions.
simple unconditional defers are open-coded and effectively free; the real costs are defers in loops (a runtime call per iteration and cleanup delayed until return — time and accumulation, not heap garbage: records are pooled on current Go) and closures that escape (which heap-allocate their captures).
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