Conteúdo do Curso
React Mastery
React Mastery
1. Introduction to React Fundamentals
What is React?SPAs vs. MPAs in Web DevelopmentHow React Works with the Virtual DOMIntroducing JSX in ReactCreating Complex JSX Elements Rendering Elements in ReactChallenge: Rendering ElementReact ComponentProps in ReactChallenge: Functional ComponentsConditional RenderingChallenge: Conditional Rendering - Chat NotificationChallenge: Conditional Rendering - Bank AlertRendering a Data CollectionChallenge: Rendering a Data CollectionIntroduction to React Section Sum-Up
2. Styling in React Apps
Introduction to Styling in ReactInline StylesInline Styles in PracticeChallenge: Inline StylesStyling with the CSS FileStyling with the CSS File in PracticeChallenge: Styling with the CSS FileStyling with the CSS ModulesFile Folder Structure OrganizationChallenge: CSS ModulesStyling in React Section Sum-Up
3. React Hooks and Context
Introduction: React Hooks and ContextuseState HookChallenge: Toggling VisibilityuseRef HookChallenge: Creating a Form ComponentuseEffect HookChallenge: Fetching and Displaying DatauseMemo HookChallenge: Car List FilteringContextContext in PracticeChallenge: World of Astronomy AppReact Hooks and Context Section Sum Up
React Hooks and Context Section Sum Up
useState Hook
- The
useStatehook is used to add state functionality; - It allows us to declare and manage state variables within a component;
- By calling the
useStatehook, we can initialize a state variable and a corresponding setter function; - Updating the state variable triggers a re-render of the component, reflecting the new state value.
useRef Hook
- The
useRefhook provides a way to create mutable variables that persist across component renders; - Unlike
useState,useRefdoesn't trigger a re-render when its value changes; - It's commonly used to access or store references to DOM elements, manage previous values, or preserve values between renders.
useEffect Hook
- The
useEffecthook enables us to perform side effects; - We can use
useEffectto handle tasks such as data fetching, subscriptions, or interacting with the DOM; - By specifying dependencies, we control when the effect runs, optimizing performance and preventing unnecessary re-renders.
useMemo Hook
- The
useMemohook allows for the memoization of expensive calculations or computations; - It takes a function and a dependencies array and returns a memoized value;
- Providing a dependencies array ensures that the memoized value is only recomputed when the dependencies change. This optimization can significantly improve performance by avoiding unnecessary recalculations.
Context
- Context allows passing data through the component tree without requiring explicit props drilling;
- It enables global state management and allows components to access shared data;
- Context consists of two main parts: the Context object and the Context Provider;
- The Context object holds the shared data, while the Provider component wraps the part of the component tree that needs access to that data;
- Consuming components can access the data using the
useContexthook.
1. Which hook is used to access shared data from a Context in a consuming component?
2. When using the `useEffect` hook, what is the purpose of specifying dependencies in the dependency array?
3. What is the primary benefit of memoizing values using the `useMemo` hook?
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Seção 3. Capítulo 13
