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Questions and Answers
What are the two types of components in React?
What are the two types of components in React?
- Class and Object components
- Object and Functional components
- Class and Functional components (correct)
- Function and Object components
Which type of component was only used for UI rendering in older versions of React?
Which type of component was only used for UI rendering in older versions of React?
- Class components
- None of the above
- Functional components (correct)
- Object components
What is the difference between Functional and Class components?
What is the difference between Functional and Class components?
- None of the above
- Functional and Class components are the same, just with different names.
- Functional components are more complex and used for data management, while Class components are simpler and only used for UI rendering.
- Functional components are simpler and only used for UI rendering, while Class components are used for data management and life-cycle methods. (correct)
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Study Notes
- A component is a self-contained, reusable code block that divides the UI into smaller pieces.
- React components accept arbitrary inputs ("props") and return React elements or JSX code that tells what should be rendered on the screen.
- There are two types of components in React: Functional and Class components.
- Functional components are the simplest way to create a component and return JSX.
- Class components are an ES6 class that extends React component class and must have a render() method that returns JSX.
- Class components were used for data management and some additional operations such as life-cycle methods, and so on.
- Functional components were only used for UI rendering in older versions of React.
- With the introduction of React hooks, we can now use states in functional components as well.
- Buttons, forms, dialog, and so on can all be expressed as components.
- Components make it easier to manage and reuse code in React.
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