including external javascript library in react code example

Example 1: import library react js

// ---- REACT JS -----
// using
<link rel="shortcut icon" href="%PUBLIC_URL%/js/bootstrap.min.js"> </link>
<script src="%PUBLIC_URL%/js/bootstrap.min.js"> </script>

// public
// --- js 
// ------ bootstrap.min.js
// --- css 
// ------ bootstrap.min.css

Example 2: how to import js via script in react

import { useEffect } from 'react';

const useScript = url => {
  useEffect(() => {
    const script = document.createElement('script');

    script.src = url;
    script.async = true;

    document.body.appendChild(script);

    return () => {
      document.body.removeChild(script);
    }
  }, [url]);
};

export default useScript;