Introduction to Classes in React
Hello friends! Today we want to talk about classes in React. Classes are one of the most fundamental concepts in React that allow us to create our own components. You might find it interesting that classes give us the ability to manage the state in components and utilize various lifecycle methods.
Well, the first thing you should know is that classes in React must inherit from React.Component. This allows your component to have additional functionalities that improve its structure and performance. By using classes, you can define the state and also write methods for managing this state.
To create a class component in React, you first need to import React and Component from the react library. Then you can create a new class using the keyword class and define the render() method to return the JSX that represents the UI of your component.
Now let's look at a simple example of a class component. In this example, we will create a simple component that displays a counter, and with each click on a button, it increments a number. Feel free to draw inspiration from this example!
import React from 'react';
class Counter extends React.Component {
constructor(props) {
super(props);
this.state = { count: 0 };
}
increment = () => {
this.setState({ count: this.state.count + 1 });
};
render() {
return (
);
}
}
export default Counter;Description of Code
import React from 'react';This line is for importing the React library, which is needed for creating components.
class Counter extends React.Component {Here, we create a class named
Counter that inherits from React.Component.constructor(props) {This is the constructor where we can initialize the initial state.
this.state = { count: 0 };Here, we define a state called
count and initialize it to 0.increment = () => {This method is used for incrementing the
count variable, which happens every time you click the button.this.setState({ count: this.state.count + 1 });With this line, the value of
count is incremented by one.render() {In this method, we return the UI of the component.
return (Here we return the JSX component that includes the displayed
count and a button.export default Counter;Finally, we export the
Counter component so that it can be used in other files.