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React: predictable interfaces and application boundaries

A complete theory course in components, state, effects, accessible interaction, concurrency, hydration, and trustworthy component APIs.

18 lessonsEnglish + ArabicContent reviewed
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In this course

Learn React through explicit rendering and ownership contracts before progressing to external synchronization, data races, framework integration, and advanced scheduling. Each level contains six substantial lessons, two explained examples per lesson, diagnostic mistakes, and worked exercises.

Code examples are JSX component modules requiring a documented React host and build configuration. They use synthetic local data and do not require real services. Their non-runnable flag records that they are not complete standalone programs, even where isolated verification bundles them into a local test host.

What you will learn

  • Build components with explicit props, state, identity, and form behavior.
  • Separate events, pure calculations, refs, and Effects.
  • Coordinate async results, routing boundaries, and accessible tests.
  • Explain transitions, memoization, SSR, hydration, and server/client integration.
  • Design secure, maintainable reusable component contracts.

Your learning path

Three levels

Components and state

Rendering, JSX, events, immutable data, forms, and identity.

  1. React rendering and a reproducible setup
  2. JSX, expressions, and component inputs
  3. Events and state snapshots
  4. Immutable state and derived values
  5. Controlled forms and validation boundaries
  6. Lists, keys, and state identity
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Coordinated application behavior

Effects, refs, reducers, context, data, routing, and interaction tests.

  1. Effects and external synchronization
  2. Refs and imperative boundaries
  3. Reducers, context, and state ownership
  4. Data loading and race control
  5. Routing and navigation boundaries
  6. Testing and accessible interactions
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Performance and trustworthy boundaries

Transitions, profiling, hydration, server boundaries, security, and APIs.

  1. Transitions and interruptible rendering
  2. Profiling and deliberate memoization
  3. Server rendering and hydration contracts
  4. Server, client, and framework boundaries
  5. Security and trusted boundaries
  6. Component APIs and custom Hooks
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Who this is for

  • Developers familiar with JavaScript, HTML, and browser events.
  • Interface authors strengthening state ownership and advanced React boundaries.

Before you start

  • Functions, closures, modules, arrays, promises, and immutable JavaScript updates.
  • Semantic HTML, forms, basic CSS, and a JSX-capable reviewed project host.

Related technical solutions

Diagnose stale closures and Effect loopsTrace the captured render, actual dependencies, and update cycle before removing dependencies or adding memoization.Diagnose invalid Hook calls and changing Hook countsSeparate call-position defects from duplicate React packages and renderer compatibility before changing dependencies.Separate hydration mismatches from key and state identity bugsDiagnose whether the first server/client tree disagrees or an existing client subtree is being preserved or reset under the wrong identity.