Kurssisisältö

React Mastery

1. Fundamentals of React and Component-Based UI

What Is React and Why Use It?Comparing SPAs and MPAs in Web Development How React Works with the Virtual DOM Introducing JSX for Writing HTML in JavaScript Building Complex UI with JSX Rendering Elements in React Challenge: Render an Element in React Understanding React Components Passing Data with Props in React Challenge: Create Functional Components Conditional Rendering in React Challenge: Implement Conditional Rendering – Chat Notification Challenge: Implement Conditional Rendering – Bank Alert Rendering Collections of Data in React Challenge: Display Data Collections in React React Fundamentals Wrap-Up

2. Styling Techniques in React Applications

Introduction to Styling in React Using Inline Styles in React Applying Inline Styles in Practice Challenge: Use Inline Styles in a React Component Styling React Components with External CSS Applying External CSS in Practice Challenge: Apply External CSS to a React App Using CSS Modules for Scoped Styling in React Organizing File and Folder Structures for Styles Challenge: Use CSS Modules in React Styling Techniques in React Wrap-Up

3. React Hooks and Context for State Management

Introduction to React Hooks and Context Managing State with the useState Hook Challenge: Toggle Visibility with useState Working with References Using the useRef Hook Challenge: Build a Controlled Form Component Handling Side Effects with the useEffect Hook Challenge: Fetch and Display Data with useEffect Optimizing Performance with the useMemo Hook Challenge: Implement a Car List Filter with useMemo Sharing State Across Components with Context Using Context in a Real-World Scenario Challenge: Build a World of Astronomy App with Context React Hooks and Context Wrap-Up

4. Structuring Real-World React Projects

Setting Up Your React Development Environment Choosing a Code Editor for React Development Organizing the Project Folder Structure Working with the Terminal in React Development Starting and Running a React Project with Vite React Project Setup Wrap-Up

Challenge: Implement Conditional Rendering – Chat Notification

Task: Creating Chat Notification

Let's devise a mechanism to display a notification only when a user has unread messages. We will verify whether the user has any unread messages. If this condition is true, we will show a notification indicating the number of messages. However, we won't display anything if the user has no messages.

The task is:

Create two components: App as the parent component and Notification as the child component.
The parent component, App, should pass a prop called messages to the child component. The messages prop is an array containing messages. In the child component, you need to check the length of the messages array.
If there are any messages in the array, display a string that says: You have <amount> of unread messages. The <amount> should be replaced with the actual count of unread messages.

To determine if there are any messages in the array, we can check its length using the length property. The syntax is - array.length.
In React, we use the operator && to implement the logic of an if statement.
To construct the string correctly, replace the placeholder amount with the actual length of the array.
Use curly braces {array.length} to set the array length in the string.

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Osio 1. Luku 12

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