Podcast
Questions and Answers
What is the main difference between functional components and class components?
What is the main difference between functional components and class components?
What is the purpose of props in React?
What is the purpose of props in React?
What is the primary use of JSX expressions?
What is the primary use of JSX expressions?
What is a key benefit of using JSX syntax?
What is a key benefit of using JSX syntax?
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What is the relationship between JSX and JavaScript?
What is the relationship between JSX and JavaScript?
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Study Notes
Components
-
Functional Components: JavaScript functions that take in props and return JSX elements.
- Example:
const Greeting = (props) => Hello, {props.name}!;
- Can be used with React Hooks to manage state and side effects.
- Example:
-
Class Components: JavaScript classes that extend the
React.Component
class.- Example:
class Greeting extends React.Component { render() { return Hello, {this.props.name}!; } }
- Can have state and lifecycle methods.
- Example:
-
Component Lifecycle: Methods that are called at different points during a component's life cycle.
- Examples:
componentDidMount()
,componentDidUpdate()
,componentWillUnmount()
- Examples:
-
Props: Immutable values passed from a parent component to a child component.
- Can be used to customize the behavior of a component.
- Example: ``
JSX
-
JSX Syntax: A syntax extension for JavaScript that allows you to write HTML-like code in your JavaScript files.
- Example:
const element = Hello, World!;
- Example:
-
JSX Elements: The building blocks of JSX, which can be used to create React components.
- Example:
<div>
,<p>
, ``
- Example:
-
JSX Attributes: Used to add properties to JSX elements.
- Example:
<a href="https://www.example.com">Visit Example</a>
- Example:
-
JSX Expressions: JavaScript expressions that can be embedded inside JSX elements.
- Example:
</p>Hello, {name}!
- Example:
-
JSX and JavaScript: JSX can be used to generate JavaScript code that creates React elements.
- Example:
const element = Hello, World!;
compiles toconst element = React.createElement("h1", null, "Hello, World!");
- Example:
React Components
- Functional Components are JavaScript functions that take in props and return JSX elements.
- They can be used with React Hooks to manage state and side effects.
- Example:
const Greeting = (props) => Hello, {props.name}!;
Class Components
- Class Components are JavaScript classes that extend the
React.Component
class. - They can have state and lifecycle methods.
- Example:
class Greeting extends React.Component { render() { return Hello, {this.props.name}!; } }
Component Lifecycle
- Component Lifecycle refers to the methods that are called at different points during a component's life cycle.
- Examples of lifecycle methods include
componentDidMount()
,componentDidUpdate()
, andcomponentWillUnmount()
.
Props
- Props are immutable values passed from a parent component to a child component.
- They can be used to customize the behavior of a component.
- Example:
JSX
JSX Syntax
- JSX Syntax is a syntax extension for JavaScript that allows you to write HTML-like code in your JavaScript files.
- Example:
const element = Hello, World!;
JSX Elements
- JSX Elements are the building blocks of JSX, which can be used to create React components.
- Examples:
,
, ``
JSX Attributes
- JSX Attributes are used to add properties to JSX elements.
- Example:
Visit Example
JSX Expressions
- JSX Expressions are JavaScript expressions that can be embedded inside JSX elements.
- Example:
Hello, {name}!
JSX and JavaScript
- JSX can be used to generate JavaScript code that creates React elements.
- Example:
const element = Hello, World!;
compiles toconst element = React.createElement("h1", null, "Hello, World!");