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Understanding Components
Content
- Understanding Components
- What is a Component?
- Creating a Functional Component
- How JavaScript Works
- Creating a Class-Based Component
- Updated on 10/09/2024
- 450 Views
What is a Component?
In React, a component is a self-contained module that represents a part of the UI. Components can be as simple as a button or as complex as an entire page. Components can be functional (written as functions) or class-based (written as classes).
Creating a Functional Component
Functional components are simple and are defined as JavaScript functions. They return JSX (JavaScript XML) to describe what the UI should look like.
Creating a Class-Based Component
Class-based components use ES6 classes and provide more features such as local state and lifecycle methods.
Props and State
Props (Properties): Props are used to pass data from parent components to child components.
State: State is used to manage data that changes over time within a component.
Activity
Build a small React application with a functional component and a class-based component. Use props to pass data between them and manage state in one of the components.
Quiz
1. What is the purpose of props in React?
- a) To manage component state
- b) To pass data from parent to child components
- c) To handle user inputs
- d) To style components
2. rue or False: Functional components in React are more complex than class-based components.
- a) True
- b) False
3. What does the state in a React component represent?
- a) A way to pass data to child components
- b) Data that changes over time within a component
- c) The appearance of the component
- d) None of the above
4. Which method is used to update the state in a class-based component?
- a) updateState()
- b) setState()
- c) changeState()
- d) modifyState()
5. True or False: Props can be used to pass data from child components to parent components.
- a) True
- b) False