JSFiddle - React, Tailwind, and code Playground

HTML

<form>

<input type="text" value="demo1" class="example"><br />
<input type="text" value="demo2" class="example"><br />
<input type="text" value="demo3" class="example">

</form>

JavaScript

var x = document.querySelectorAll(".example");

var a = new Array();

for(var i = 0; i < 3; i++){
    a[x[i].value] = x[i].value;
}

alert(a['demo1'] + ' ' +a['demo2'] + ' ' + a['demo3']);