how to use jquery in another js file code example

Example 1: javascript import jquery

//add this line somewhere in the html
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>

Example 2: how to import jquery in js file

var script = document.createElement('script');
script.src = 'https://code.jquery.com/jquery-3.4.1.min.js';
script.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script);