https://nalar.dev/tags/control-flow/ Recent content in Control Flow on Nalar Hugo en-us Wed, 16 Sep 2026 00:00:00 +0700 https://nalar.dev/go-defer-saves-call-arguments-before-return/ Wed, 16 Sep 2026 00:00:00 +0700 https://nalar.dev/go-defer-saves-call-arguments-before-return/ <p>A Go <code>defer</code> statement evaluates its function value and call parameters when execution reaches the statement, even though the deferred function runs only as the surrounding function returns. Mutations between those two moments do not retroactively change already saved argument values.</p> <p>This split between evaluation and invocation is part of the language semantics rather than an optimization detail. Each executed <code>defer</code> records a call with values established at that point. Return processing later invokes recorded calls in reverse registration order.</p>