Mastering React Hooks: Zero to Hero

Understand state in React as a mutable object that drives dynamic user interfaces by tracking data. Distinguish state from props and see a countdown example with a setter and interval.

Mastering React hooks shows useState managing state in functional components through a countdown. The countdown updates every second with setInterval, and useEffect will address the re render issue.

Master a complex state with the useState hook by managing an array of to-do items, updating by id, and using the spread operator to avoid direct mutation.

Master the useState hook to handle user inputs in functional components, wiring name, email, and password fields with onChange and two-way binding, printing values to the console.

Sharpen your skills with a hands-on exercise using the useState hook to build a shopping cart. Learn to add and remove items, display the total cost, and count the items.

Master React lifecycle methods in class components, covering mounting, updating, and unmounting, with practical examples of data fetching, event listeners, and cleanup using the useEffect hook.

Use the useEffect hook to manage mounting, updating, and cleanup in functional components, using dependency arrays (including empty arrays) to control when effects run.

Use the useEffect hook to run side effects in functional components, such as fetching data from an API, updating the document title, or subscribing to events, with cleanup on unmount.

Learn to clean up side effects with the useEffect cleanup function, control interval timers with dependency arrays, and prevent memory leaks for better performance.

Explore how to use the useEffect hook to respond to prop and state changes in React components, keeping child state synchronized with parent updates and mounting behavior.

Learn how context in React helps share data across components without prop drilling, using createContext and provider. Access the shared data with useContext to simplify state and reduce rerenders.

Create a context with createContext, wrap components with a context provider using a value, and access it via use context hook to share data like a user’s name across components.

Create a todo context with createContext and manage the item list using useState, then wrap components in the provider with a value, access todos with useContext, and add items.

Explore why reducers enable predictable state management in React by using a pure function that takes the current state and an action to return a new state.

Master the useReducer hook with a reducer function to manage state in complex components via actions and dispatch, illustrated by a shopping cart and the use of useContext for scalability.

Optimize React apps by minimizing unnecessary rerenders, leveraging memoization and lazy loading, caching and data normalization, and reducing bundle size with code splitting and tree shaking.

Learn how the useCallback hook memoizes functions to prevent unnecessary rerenders, boost performance, and safely pass stable callbacks to optimized child components in React.

Use the useMemo hook to memoize a value, avoiding expensive recomputations when inputs do not change, as shown with a number input and square-root calculation.

Explore how the useRef hook creates a mutable reference that persists across rerenders, accessible via the current property for direct DOM access and cross-component persistence.

Use the useRef hook to access and modify DOM nodes from functional components, including focusing an input with a button, and using effects for initial focus.

Learn how the useRef hook stores mutable values across rerenders without triggering re-renders, track the previous random value, and compare useRef with useEffect to avoid infinite render loops.

Master the useDeferredValue hook in React 18 to defer rendering of lower-priority content, boosting performance and perceived fluidity by delaying updates, with simple usage in JSX.

Learn to manage deferred state updates in large React apps with the use deferred value hook, deferring noncritical updates to prioritize user input.

Learn how the useId hook, imported from React, generates unique IDs for elements in components, improving accessibility for screen readers and label-input interactions, with an optional prefix and a counter.

Explore generating unique ids with the use id hook, linking labels to inputs for accessibility, and applying this to a form with username, email, confirm email, and password fields.

Understand the difference between declarative and imperative code in React, and see why imperative patterns matter for map and loop examples, external libraries, and direct DOM manipulation.

Expose a child component's methods to its parent using the useImperativeHandle hook, with forwardRef and useRef to access functions like logSomething from the parent.

Mastering React hooks: zero to hero introduces the use layout effect hook, showing how to perform DOM updates synchronously before paint to prevent flicker during layout and measurements.