Reactjs

Learn what prop drilling is in React, why passing props through multiple component layers causes maintenance issues, and how to solve it using Context API or state management tools.

Understanding when to use local state, Context API, or Zustand for state management in React applications. Learn the scope, best practices, and practical examples for each approach.

Learn how to fix stale closure issues in React using three key techniques: dependency arrays, functional updaters (setState(prev => ...)), and useRef for latest values. Includes proper cleanup patterns for async operations to prevent memory leaks and race conditions.

Understand how React callbacks capture values from the moment they are created, causing stale state issues in setInterval, useEffect, and event handlers. Learn to fix this using functional updaters and refs to always access fresh values.

Learn the key differences between useState and useReducer in React. Understand when to use simple state management versus structured reducers for complex state logic, with practical examples including counters and form management.

Understanding the critical timing difference between useEffect and useLayoutEffect - when to use each hook to prevent UI flicker and optimize performance in React applications.

Exploring how Custom Hooks revolutionized React by solving logic reuse challenges that plagued Class components, HOCs, and Render Props - making code cleaner, more composable, and easier to maintain.

Understanding useEffect - the essential hook for managing side effects in React function components, from data fetching to event listeners, with proper cleanup and dependency management.

Learn why React requires immutable state updates and how reference equality checking works. Understand the difference between primitive and reference comparisons, common pitfalls with object mutations, and best practices for creating new references to trigger re-renders correctly.

Understand why React keys matter in list rendering. Learn how using array indexes as keys causes UI bugs like jumping input values, and why stable unique IDs are essential for proper reconciliation. Discover the difference between correct and incorrect key usage with practical examples.

Learn how React Reconciliation works - the smart update process that compares Virtual DOM trees using three key rules: different element types get replaced, same types get updated, and lists use keys for tracking. This efficient diffing algorithm reduces O(n³) complexity to O(n), updating only what actually changed in the real DOM.

Learn why React uses a Virtual DOM instead of direct DOM manipulation. Discover how this JavaScript object tree in memory optimizes performance by batching updates, reducing reflows and repaints, while providing a better developer experience through declarative UI patterns.

Learn about React component lifecycle - how components mount, update, and unmount - and understand the differences between class component lifecycle methods and function component Hooks.

Learn what JSX is, how it compiles from React 16 to React 17+, and master essential JSX syntax rules for writing React components.

Understanding pure functions and why React components should stay pure. Learn the key rules and benefits of writing pure components in React.