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Ahmed Mahmoud

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Articles

React Compiler in 2026: What It Actually Memoizes (And What It Doesn't)

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By Ahmed Mahmoud
| DEV Community
Headline: React Compiler — formerly React Forget — shipped stable with React 19 and automatically memoizes components, hooks, and callbacks by analyzing data flow at build time. No dependency arrays to write; the compiler infers them. Here is what it handles, when it opts out, and whether you should delete your useMemo calls. Key takeaways React Compiler inserts useMemo, useCallback, and React.memo automatically at build time — no dependency arrays to maintain.
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Partial Prerendering in Next.js: The Static Shell + Dynamic Stream Model

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By Ahmed Mahmoud
| DEV Community
Headline: Partial Prerendering (PPR) in Next.js serves a static HTML shell from the CDN edge instantly, then streams Suspense-wrapped dynamic children from the origin in the same HTTP response. No full-page ISR staleness, no full-page origin latency. I shipped it on two production routes — here is the model. Key takeaways PPR serves a static HTML shell from the CDN edge, then streams dynamic Suspense children from the origin in the same response.
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useOptimistic in React 19: Patterns and Pitfalls from Real Forms

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By Ahmed Mahmoud
| DEV Community
Headline: React 19's useOptimistic shows the result of an action before the server confirms it. The API is tiny; the mental model is where people trip. Here's what held up across a comment box, a like button, and a settings form — plus three edges that cost me an afternoon each. The mental model useOptimistic stores nothing durable. It's a view over your real state that is only live while a transition is pending.
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