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Summary - JSX basics

Combine JSX expressions, attributes and styles to write a welcome card.

Summary - JSX basics

In this group you learned what JSX is, how to embed JavaScript expressions in curly braces, and how attributes are written in JSX. Now it's time to put it together.

The flow is: define a function, return JSX inside it, put dynamic values in curly braces, and write camelCase attributes such as className and htmlFor. Finally, export the component with export default.

In the next step you'll combine these in a single component.

Practice Welcome card

Complete the skeleton. Write a component called Welcome that returns <section className="welcome"> with <h1>Hello</h1> and <p>Welcome to React</p> inside. Don't forget to export.

Starter code

App.jsx
// Write the Welcome component here

Sample solution

App.jsx
function Welcome() {
  return (
    <section className="welcome">
      <h1>Hello</h1>
      <p>Welcome to React</p>
    </section>
  );
}

export default Welcome;

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What goes inside curly braces?

  • An HTML tag
  • A CSS rule
  • A comment
  • A JavaScript expression Correct answer

Explanation: Curly braces hold a JavaScript expression.

2 Match the flow steps

Term Meaning
function Define
return Return
className Class
export default Export

All lessons in Beginner

1 React intro

  1. What is React?
  2. Setup and Vite
  3. Your first component
  4. Summary - React intro

2 JSX basics

  1. What is JSX?
  2. Expressions and curly braces
  3. Attributes and className
  4. Summary - JSX basics

3 Components

  1. Component logic
  2. Component tree
  3. Naming rules
  4. Summary - Components

4 Profile card

  1. Project: Profile card
  2. Avatar component
  3. Info list
  4. Assemble the card

5 Props

  1. What are props?
  2. Reading props
  3. Children prop
  4. Default props
  5. Summary - Props

6 Conditional rendering

  1. What is conditional rendering?
  2. Ternary operator
  3. Logical AND (&&)
  4. Early return
  5. Summary - Conditional rendering

7 List rendering

  1. What is list rendering?
  2. The key attribute
  3. Array to components
  4. Filtering and sorting
  5. Summary - List rendering

8 Shopping list

  1. Project: Shopping list
  2. Item component
  3. List body
  4. Empty state

9 Events

  1. Events
  2. The event object
  3. Form events
  4. Summary - Events

10 useState

  1. What is state?
  2. The useState call
  3. Updating state
  4. Multiple state values
  5. Summary - useState

11 Counter app

  1. Project: Counter app
  2. Number and buttons
  3. Decrement and reset
  4. Boundary control

12 Forms

  1. Controlled input
  2. Form submission
  3. Multiple fields
  4. Summary - Forms

13 Styling

  1. Styling with CSS
  2. CSS Modules
  3. Inline styles
  4. Summary - Styling

14 styled-components

  1. What is styled-components?
  2. Styling with props
  3. Using themes
  4. Summary - styled-components

15 useReducer

  1. What is useReducer?
  2. Action and state
  3. useState vs useReducer
  4. Summary - useReducer

16 useEffect

  1. What is useEffect?
  2. Dependency array
  3. Cleanup function
  4. Summary - useEffect

17 Context

  1. What is context?
  2. createContext
  3. Provider and useContext
  4. Summary - Context

18 useRef

  1. What is useRef?
  2. DOM access
  3. Timer example
  4. Summary - useRef

19 Todo app

  1. Project: Todo app
  2. Todo entry form
  3. Todo list
  4. Filter and summary

20 Beginner final

  1. Challenge: Weather card
  2. Challenge: Cart summary
  3. Challenge: Counter and reset
  4. Challenge: Dropdown menu