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The Ultimate Refactor: From Nested to Guard Clauses #webdev #tutorial
Turn a messy, nested addToCart into a tiny, pure function using guard clauses and immutability. This 30-second refactor is production-friendly for React/Redux/Next.js carts and avoids hidden bugs from in-place mutation. You’ll learn how to early-return invalid input, update or insert in one pass, and always derive total from items for ...
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