equivalent class, hooks and function components
class Example extends React.Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
}
render() {
return (
<div>
<p>You clicked {this.state.count} times</p>
<button onClick={() => this.setState({ count: this.state.count + 1 })}>
Click me
</button>
</div>
);
}
}hooks in class components
class ClassRoom extends React.Component{
constructor(props){
super(props);
this.state = {studentsCount : 0};
this.addStudent = this.addStudent.bind(this);
}
addStudent(){
this.setState((prevState)=>{
return {studentsCount: prevState.studentsCount++}
});
}
render(){
return(
<div>
<p>Number of students in class room: {this.state.studentsCount}</p>
<button onClick={this.addStudent}>Add Student</button>
</div>
)
}
}react hooks inside class component
import { useEffect, useState } from 'react';
export function useScreenWidth(): number {
const [width, setWidth] = useState(window.innerWidth);
useEffect(() => {
const handler = (event: any) => {
setWidth(event.target.innerWidth);
};
window.addEventListener('resize', handler);
return () => {
window.removeEventListener('resize', handler);
};
}, []);
return width;
}Copyright © 2021 Codeinu
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