Git lets you rewrite history — amend a commit, squash a messy branch, drop a secret that was committed by mistake. But "rewrite" is a misnomer: you never edit a commit, you replace it with a new one and move a pointer. Once you understand that, the rules for doing it safely become obvious, and the one genuine danger — rewriting history other people are building on — comes into sharp focus. This closing post turns the whole series into a working discipline.
"Rewrite" is a misnomer: you never edit a commit, you replace it with a new one and move a pointer. Once you see that, the rules for doing it safely become obvious — and the one real danger, rewriting history others build on, comes into sharp focus. The capstone that turns the series into a discipline.
Knowing the type system isn't the same as using it well. Idiomatic TypeScript is a set of judgments: lean on inference, avoid `any`, model impossible states out of existence, and know when a type earns its complexity. On a large, long-lived codebase these habits are the difference between types that catch bugs and types that are decorative noise. This closing post turns the mechanics of the series into a working discipline.
Knowing the type system isn't the same as using it well. Idiomatic TypeScript is a set of judgments: lean on inference, avoid any, model impossible states out of existence, and know when a type earns its complexity. On a large codebase these habits separate types that catch bugs from types that are decorative noise.
Two things separate C programmers who ship reliable code from those who ship time bombs: understanding the preprocessor (the text-substitution pass that runs before compilation) and respecting undefined behavior (the operations C says have no defined meaning at all). This closing post covers both, plus the multi-file structure of real programs and the idioms that keep C safe — turning the whole series into a working discipline.
Two things separate C programmers who ship reliable code from those who ship time bombs: understanding the preprocessor (the text-substitution pass before compilation) and respecting undefined behavior (operations C says have no meaning at all). This closing post covers both, multi-file programs, and the idioms that keep C safe.