Key takeaways:
- Components: The building blocks of React apps, allowing for reusable code and dynamic display of data.
- JSX: JavaScript in disguise, used to define the structure and appearance of components.
- Rendering: The process by which React updates the DOM based on changes in component state.
- Hooks: Special functions that allow components to access React features like state and effects.
React is a JavaScript library for building user interfaces, focusing on components, JSX, rendering, and hooks.
# Components
- Building blocks: Components are the foundation of React apps, allowing for reusable code and dynamic display of data.
- JavaScript functions: Every React component is a JavaScript function that returns markup.
- JSX: Components return JSX, which is JavaScript in disguise, making it easier to write and understand.
# JSX
- JavaScript in Disguise: JSX is optional but recommended for creating user interfaces.
- Attributes: HTML attributes are written in camel case style, e.g., instead of .
- Dynamic JavaScript values: JSX supports the use of dynamic JavaScript values using curly braces.
# Rendering
- Virtual DOM: React uses a virtual DOM to efficiently update the real DOM based on changes in component state.
- Diffing: React compares the updated virtual DOM to a previous version to see what's changed.
- Reconciliation: React updates the real DOM with the changes found during diffing.
# Hooks
- Special functions: Hooks allow components to access React features like state and effects.
- useState: A hook for managing state within React components.
- useEffect: A hook for connecting with external systems like browser APIs and performance hooks.
React's focus on components, JSX, rendering, and hooks provides a powerful and flexible way to build user interfaces with JavaScript. By understanding these core concepts, developers can create efficient, dynamic, and maintainable applications.
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