JSFiddle - React, Tailwind, and code Playground

HTML

<input id="txtName" value="My name is " />

<button id="btnGetData">Say what?</button>

JavaScript

$.fn.appendMe = function(strToAppnd)
{
    var newTxt = this.val() + strToAppnd;
    this.val(newTxt);

    this.getData = function getData()
    {    
        return newTxt;
    }
    return this;
}

$(document).ready(function (){
debugger;
    var finalForm = $('#txtName').appendMe('Enteng');

    $('#btnGetData').click(function (e)
        {
            e.preventDefault();
            
            var result = finalForm.getData();
            
            alert(result);
        });
});