Gotchas
Common pitfalls and subtle bugs in Python, TypeScript, and React — the kind that trip you up in interviews and production code.
Py
Python Gotchas
Mutable defaults, late binding closures, scope traps, and other pitfalls that bite even experienced Python developers.
TS
TypeScript Gotchas
Type assertions that lie, structural typing surprises, nullish vs falsy, and the gaps between types and runtime.
Re
React Gotchas
Stale closures, reference equality, useEffect pitfalls, and the mental model mistakes that cause subtle bugs.