JSFiddle - React, Tailwind, and code Playground
HTML
<select onchange="anotherFunction(event)">
<option value="first">Hello World 1</option>
<option value="second">Hello World 2</option>
<option value="third">Hello World 3</option>
<option value="fourth">Hello World 4</option>
</select>
JavaScript
function anotherFunction(event) {
var a = $("select :selected").val();
console.log(a)
}