Why Runtime Assertions Matter More Than You Think

Disabling assertions in production—a widespread practice—fundamentally compromises code reliability and is an irredeemably bad practice that must be abandoned. Runtime assertions serve as a critical defense mechanism that outperforms traditional unit tests in catching programming errors, especially when combined with fuzzing techniques. Zig's assertion system, built on the unreachable keyword, demonstrates how modern languages can enforce safety guarantees across multiple build modes, making assertions a first-class tool for preventing bugs before they reach production.