Grokking React Advanced
Take React further with context, memoization, React Compiler, transitions, code splitting, TanStack Query, React 19 forms, Redux Toolkit, and custom hooks.
Course Overview
Once a React application grows past a few screens, new questions appear: why a component re-renders when its data did not change, why typing freezes while a list updates, why the first page takes so long to download, and where server data should live. This course answers those questions with the tools React and its ecosystem provide today. You start by sharing state across a component tree with the Context API and measuring what each change re-renders. You then remove unnecessary work with memo, useMemo, useCallback, and React Compiler, keep the page responsive with useTransition and useDeferredValue, and load code on demand with lazy, Suspense, dynamic imports, and error boundaries. Later chapters manage server data with TanStack Query, including mutations and Suspense, build forms with React 19 form actions and validation libraries, and keep global state in Redux, first in plain Redux and then with Redux Toolkit and RTK Query. The course ends by designing, composing, and testing your own custom hooks. Every lesson follows one running example and shows real render counts and output, and every chapter after the introduction ends with an assessment that explains each answer.
What you'll learn in Grokking React Advanced
- Share state across a component tree with context, use, and useReducer, and know when not to.
- Turn on React Compiler in a Vite project and know where it changes the manual memoization advice.
- Split an app into files that load on demand with lazy, Suspense, and dynamic import().
- Fetch, cache, and refresh server data with TanStack Query, useQuery, and well-designed query keys.
- Load data behind Suspense with React's use function and useSuspenseQuery.
- Validate complex forms by hand, with Formik and Yup, and with React Hook Form and Zod.
- Design, compose, and test custom hooks that return stable values and clean up their effects.
- Measure re-renders and remove the unnecessary ones with memo, useMemo, and useCallback.
- Keep typing responsive during slow renders with useTransition and useDeferredValue.
- Lazy load routes with React Router and recover from render errors with error boundaries.
- Change server data with useMutation and keep the cache correct with query invalidation.
- Handle forms with React 19 form actions, useActionState, useFormStatus, and useOptimistic.
- Build a Redux app from actions, reducers, and middleware, then rewrite it with Redux Toolkit.
Course Content
Designing Custom Hooks
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About the Author
Arslan Ahmad
Industry Expertise & Leadership
Arslan Ahmad is the lead author of Grokking React Advanced. As the founder of Design Gurus and a former FAANG hiring manager, he has worked at industry giants like Facebook (now Meta) and Microsoft.
He has conducted hundreds of system design interviews, giving him unique insight into what top tech companies look for in candidates.
The course also incorporates expertise from senior engineers at Google, Meta, Amazon, Microsoft, and Uber, ensuring you learn system design best practices from professionals who have built and scaled real-world systems.
500+
Interviews Conducted
10k+
Students Taught
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FAQs
What is Grokking React Advanced?
It is a course on the parts of React that matter once an application grows past a few screens: sharing state across a large tree, skipping repeated rendering work, keeping the page responsive during slow renders, loading code on demand, managing server data, handling forms with React 19, keeping global state in Redux, and designing your own hooks.
Who is this course for?
It is for developers who already build components with React and want to understand why an app re-renders, waits, or slows down, and which tool fixes each problem. It suits frontend developers moving to larger codebases and full-stack developers who maintain a React client.
What do I need to know before I start?
You should be able to write components with JSX and props, keep state with useState and useReducer, handle events and forms, use refs and useEffect, set up routes with React Router, and write a simple custom hook. You do not need to know Redux, TypeScript, testing tools, or Server Components.
Do I need to take Grokking React Fundamentals first?
Only if you are new to React. This course continues where Grokking React Fundamentals ends, so readers who finished it, or who learned the same material elsewhere, can start here. When a lesson relies on a basic idea, it recalls it in a sentence and then goes further.
Which version of React does the course use?
The examples use React 19 in projects created with Vite, along with TanStack Query v5 and Redux Toolkit. The course replaces Create React App, ReactDOM.render, and the old react-query package with their current forms, and it points out the older form where you are likely to meet it in existing code.
Does the course cover React Compiler?
Yes. The memoization chapter first teaches memo, useMemo, and useCallback, because most existing code uses them, and then turns on React Compiler in a Vite project. It runs the same examples through the compiler, compares the render counts, and explains what the compiler cannot memoize for you.
Should I use Context, Redux, or React Query?
The course answers this with examples. React Query manages data that comes from a server, context passes a value to a part of the tree, and Redux keeps client state in a store outside the tree. Each chapter shows where its tool fits, where it does not, and what it costs in re-renders and code.
Are there quizzes or assessments?
Yes. Every chapter after the introduction ends with an assessment, and each attempt draws a set of questions from a larger pool, so a second attempt gives you different questions. Most questions describe a situation, like predicting which components re-render after a click, and every option comes with an explanation of why it is right or wrong.
Were the code examples tested?
Yes. Every example was run in an automated test environment on React 19, and the render counts and console output in the lessons come from those runs. The React Compiler setup was built in a real Vite project. Paint timing and browser DevTools were not measured, so lessons that discuss them rely on the official documentation.
What does the course not cover?
It does not teach TypeScript, React Server Components, Next.js, server rendering, styling, or React Native, which has its own course, Grokking React Native. Testing appears only in the last chapter, where it is used to test custom hooks.
