What are the components in react?

In the React JavaScript library for building user interfaces, a `component` is a reusable piece of code that represents a part of a user interface. Components can be thought of as the building blocks of a React application, and they can be either functional or class-based.

Here are some of the main components of a React application:

• `Props` (short for "properties") are input values that are passed to a component when it is rendered. They are used to customize the behavior and appearance of a component.
• `State` is an object that represents the internal, mutable state of a component. It is used to store data that can change within a component and trigger a re-render when it does.
• `Render` method is a required method in a class-based component that returns a description of what the component should render. In a functional component, the `render` method is implicit and the component returns the description directly.
• `Lifecycle methods` are optional methods that can be defined in a class-based component to execute code at specific points in the component's lifecycle. Examples include `componentDidMount`, which is called after the component has been rendered to the DOM, and `shouldComponentUpdate`, which is called before a re-render and can be used to optimize performance by canceling the update if certain conditions are met.

Here is an example of a functional component in React:

import React from 'react';

const MyComponent = (props) => {
  return (
    <div>
      <h1>{props.title}</h1>
      <p>{props.description}</p>
    </div>
  );
}

export default MyComponent;

And here is an example of a class-based component in React:

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  render() {
    return (
      <div>
        <h1>{this.props.title}</h1>
        <p>{this.props.description}</p>
        <button onClick={() => this.setState({ count: this.state.count + 1 })}>
          Click me
        </button>
        <p>You've clicked the button {this.state.count} times.</p>
      </div>
    );
  }
}

export default MyComponent;

Rakib Alom

About author

I am a professional web developer. I love programming and coding, and reading books. I am the founder and CEO of StorialTech.