What is component in reactjs

Aug 7, 2022Download as pptx, pdf

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Components are the building blocks of React applications. There are two main types of components: functional components and class components. Functional components are simple functions that return JSX and are stateless, while class components extend React.Component and can hold state and lifecycle methods. Other component types include pure components and high-order components. Components are independent and reusable code used to build up the UI of a React application from smaller parts.

Understanding
What is Component?
Types of Components

What is Component?
•Basic meaning of component is “one of several
parts of which something is made”
•In ReactJS one UI page is consists of so many
component(s).
•Components are independent and reusable
code. Building blocks of ReactJS Application.

What is Component?
•Components is like JavaScript functions, but work
individually to return JSX code as elements for UI.
•Parent Component is group of all child
components.

Types of Components
 Functional Components
 Class Components
 Pure Component
 High-Order Components

Most read

•Its like a function that takes in props and return JSX.
•JSX stands for JavaScript XML. It is simply a syntax
extension of JavaScript. JSX allows us to write HTML
in React.
•Functional component is also known as a stateless
component because not hold or manage state.
Functional Component

• Example: Hello.js
// Functional Component Example
import React from 'react';
function Hello(props){
return (
<h1>
Welcome to Learn {props.name}
</h1>
)
}
export default Hello;
Functional Component

• Example: HelloWorld.js
// Functional Component Example
import React from 'react';
const HelloWorld =()=> {
return (
<div>
<p>Hello World!</p>
</div>
)
}
export default HelloWorld;
Functional Component

•Declaring this component as Class type.
•Class components are child classes of
React.Component
Class Component

// Class Component Example
import React from 'react';
class ViewHelloWorld extends React.Component {
render() {
return (
<div>
<p>Hello World!</p>
</div>
)
}
}
export default ViewHelloWorld;
Class Component

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What is component in reactjs

1. Understanding What is Component? Types of Components

3. What is Component? •Basic meaning of component is “one of several parts of which something is made” •In ReactJS one UI page is consists of so many component(s). •Components are independent and reusable code. Building blocks of ReactJS Application.

4. What is Component? •Components is like JavaScript functions, but work individually to return JSX code as elements for UI. •Parent Component is group of all child components.

5. Types of Components  Functional Components  Class Components  Pure Component  High-Order Components

6. •Its like a function that takes in props and return JSX. •JSX stands for JavaScript XML. It is simply a syntax extension of JavaScript. JSX allows us to write HTML in React. •Functional component is also known as a stateless component because not hold or manage state. Functional Component

7. • Example: Hello.js // Functional Component Example import React from 'react'; function Hello(props){ return ( <h1> Welcome to Learn {props.name} </h1> ) } export default Hello; Functional Component

8. • Example: HelloWorld.js // Functional Component Example import React from 'react'; const HelloWorld =()=> { return ( <div> <p>Hello World!</p> </div> ) } export default HelloWorld; Functional Component

9. •Declaring this component as Class type. •Class components are child classes of React.Component Class Component

10. // Class Component Example import React from 'react'; class ViewHelloWorld extends React.Component { render() { return ( <div> <p>Hello World!</p> </div> ) } } export default ViewHelloWorld; Class Component

What is component in reactjs

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