JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="input-1" placeholder="Type a space here"></textarea>
<br/>
Char code: <span id="char-1"></span>
<br/>
<textarea id="input-2" class="no-wrap" placeholder="Type a space here"></textarea>
<br/>
Char code: <span id="char-2"></span>
<br/>
<button id="do">Get Chars</button>

CSS

.no-wrap {
resize: none;
white-space: nowrap;
overflow: auto;
}

JavaScript

$("#do").click(function(){
    
    var value = $("#input-1").val();
    $("#char-1").text(value.charCodeAt(value.length - 1));
    
    value = $("#input-2").val();
    $("#char-2").text(value.charCodeAt(value.length - 1));
    
});