JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="unshift.js"></script>
</head>
<body onload="tnwFun1();">
    <p id="demo"></p>
    <p id="demo1"></p>
    <input type="text" name="newname" id="newname" placeholder="Type here...">
    <button type="button" onclick="tnwFun2()">Add new names</button>
</body>
</html>

CSS

button{
  cursor: pointer;
}

JavaScript

const tnwNames = ["Moe", "Soe", "Noe", "Mya"];

function tnwFun1(){
    document.getElementById("demo").innerHTML = tnwNames.join(", ");
}

function tnwFun2(){
    document.getElementById("demo").innerHTML = "The original array is " + tnwNames.join(", ");
    let tnwNewvalue = document.getElementById("newname").value;
    tnwNames.unshift(tnwNewvalue);
    document.getElementById("demo1").innerHTML = "The new array is " + tnwNames.join(", ");
}