samdeepthink

Sep 8, 2026 · Fundamentals

Why If Nesting Beyond 3 Levels Hides Bugs: Flatten with Guard Clauses

The article demonstrates how deep if nesting (over 3 levels) obscures bugs using a payment callback example where error messages are swapped, then refactors with guard clauses to flatten logic; it also addresses loop nesting by extracting methods to reduce cognitive load, emphasizing keeping conditions close to their handling.