use propTypes in react function
import React from 'react';
import { PropTypes } from 'prop-types';
const student = (props) => {
return (
<div>
<p>Student Name: {props.name}</p>
<p>Age: {props.age}</p>
</div>
);
};
student.propTypes = {
name: PropTypes.string,
age: PropTypes.number
};
export default student;useRef
/*
A common use case is to access a child imperatively:
*/
function TextInputWithFocusButton() {
const inputEl = useRef(null);
const onButtonClick = () => {
// `current` points to the mounted text input element
inputEl.current.focus();
};
return (
<>
<input ref={inputEl} type="text" />
<button onClick={onButtonClick}>Focus the input</button>
</>
);
}callback in react
import React, { useCallback } from 'react';
function MyComponent() {
// handleClick is the same function object
const handleClick = useCallback(() => { console.log('Clicked!'); }, []);
// ...
}how to use hooks react
const App = () => {
const [students , setStudents] = useState([]);
return (
// put in the jsx code here
)
}Copyright © 2021 Codeinu
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