JSFiddle - React, Tailwind, and code Playground

HTML

<select id="selecty" multiple size=6 width=150 style="width:150px" name="ToLB" >
    <option value="monkey">Monkey</option>
</select>

JavaScript

var listarray = new Array(); 

var select = document.getElementById('selecty');

for(var i = 0; i < select.options.length; i++){
   listarray.push(select.options[i].value);
}
console.log(listarray);