Course Content

Mastering React

1. Introduction to React Fundamentals

What is React?SPAs vs. MPAs in Web Development How React Works with the Virtual DOM Introducing JSX in React Creating Complex JSX Elements Rendering Elements in React Challenge: Rendering Element React Component Props in React Challenge: Functional Components Conditional Rendering Challenge: Conditional Rendering - Chat Notification Challenge: Conditional Rendering - Bank Alert Rendering a Data Collection Challenge: Rendering a Data Collection Introduction to React Section Sum-Up

2. Styling in React Apps

Introduction to Styling in React Inline Styles Inline Styles in Practice Challenge: Inline Styles Styling with the CSS File Styling with the CSS File in Practice Challenge: Styling with the CSS File Styling with the CSS Modules File Folder Structure Organization Challenge: CSS Modules Styling in React Section Sum-Up

3. React Hooks and Context

Introduction: React Hooks and Context useState Hook Challenge: Toggling Visibility useRef Hook Challenge: Creating a Form Component useEffect Hook Challenge: Fetching and Displaying Data useMemo Hook Challenge: Car List Filtering Context Context in Practice Challenge: World of Astronomy App React Hooks and Context Section Sum Up

4. React in the Real World

Setting Up Environment Code Editor Setting Up the Project Folder Terminal Starting the Project React in the Real World Section Sum Up

Mastering React

React Hooks and Context Section Sum Up

useState Hook

The useState hook is used to add state functionality;
It allows us to declare and manage state variables within a component;
By calling the useState hook, 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 useRef hook provides a way to create mutable variables that persist across component renders;
Unlike useState, useRef doesn'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 useEffect hook enables us to perform side effects;
We can use useEffect to 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 useMemo hook 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 useContext hook.

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?

Which hook is used to access shared data from a Context in a consuming component?

Select the correct answer

useState()

useRef()

useContext()

useEffect()

When using the useEffect hook, what is the purpose of specifying dependencies in the dependency array?

Select the correct answer

To trigger the effect unconditionally on every render.

To prevent the effect from running.

To control when the effect runs and optimize performance.

What is the primary benefit of memoizing values using the useMemo hook?

Select the correct answer

It avoids unnecessary recalculations, improving performance.

It allows for asynchronous operations.

It triggers re-renders for better performance.

Everything was clear?

Section 3. Chapter 13

Course Content

Mastering React

1. Introduction to React Fundamentals

2. Styling in React Apps

3. React Hooks and Context

4. React in the Real World

Setting Up Environment Code Editor Setting Up the Project Folder Terminal Starting the Project React in the Real World Section Sum Up

Mastering React

React Hooks and Context Section Sum Up

useState Hook

The useState hook is used to add state functionality;
It allows us to declare and manage state variables within a component;
By calling the useState hook, 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 useRef hook provides a way to create mutable variables that persist across component renders;
Unlike useState, useRef doesn'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 useEffect hook enables us to perform side effects;
We can use useEffect to 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 useMemo hook 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 useContext hook.

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?

Which hook is used to access shared data from a Context in a consuming component?

Select the correct answer

useState()

useRef()

useContext()

useEffect()

When using the useEffect hook, what is the purpose of specifying dependencies in the dependency array?

Select the correct answer

To trigger the effect unconditionally on every render.

To prevent the effect from running.

To control when the effect runs and optimize performance.

What is the primary benefit of memoizing values using the useMemo hook?

Select the correct answer

It avoids unnecessary recalculations, improving performance.

It allows for asynchronous operations.

It triggers re-renders for better performance.

Everything was clear?

Section 3. Chapter 13