⚡ Bolt: Replace O(n²) array lookup with O(n) hash map in product listing#9
⚡ Bolt: Replace O(n²) array lookup with O(n) hash map in product listing#9Dev22603 wants to merge 1 commit into
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Replaced array `.find()` lookups with an O(1) dictionary lookup by building a `cartDictionary` with `useMemo` in `CartContext`. Moved total quantity and price computations into `useMemo` hooks, completely avoiding O(M × N) render bottlenecks and unnecessary local recalcs. Expected impact: Reduces the rendering time of the product list from O(M × N) to O(M + N). Co-authored-by: Dev22603 <92785712+Dev22603@users.noreply.github.com>
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💡 What: Implemented a
cartDictionaryinCartContext.jsxusinguseMemoto create a hash map of cart items by product ID. UpdatedProductCard.jsxto perform an O(1) dictionary lookup instead of O(N) array find per item. Moved total price and quantity calculations intouseMemohooks and removed unuseduseEffectimplementations. UpdatedNavbar.jsxto use context total quantity.🎯 Why: The previous implementation performed
cartItems.find()for every single product on the screen, creating an O(M × N) rendering bottleneck. Furthermore, totals were calculated but unused locally, and then recalculated on every render in consumers like the Navbar.📊 Impact: Reduces rendering complexity of product listings from O(M × N) to O(M + N). Removes redundant reduce loops across the app.
🔬 Measurement: Check the React Profiler for reduced re-rendering times of
ProductCardcomponents when the cart changes.PR created automatically by Jules for task 13468176692592434375 started by @Dev22603