JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="txtMyText">
	<button type="button" id="myButton" onclick="addItemToArray()">Add to Array</button>

JavaScript

if(localStorage.getItem('textValues') == null){
	var myArray =[];
}else{
	myArray =  JSON.parse(localStorage.getItem('textValues'));
}

alert('last item stored ' + myArray[myArray.length-1]);

function addItemToArray(){
	myArray.push(document.getElementById("txtMyText").value);
	localStorage.setItem('textValues', JSON.stringify(myArray));
}