JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output"></div>
<div id="output2"></div>
<div id="output3"></div>

JavaScript

var array1 = ["one"];
var array2 = ["one"];
var array3 = ["one"];

function change(array) {
   var array2 = ["222"];
   array = array2;
}

function change2(array) {
   array[0] = ["222"];
}

function change3(array) {
   var array2 = array;
   array2[0] = ["222"];
}

change(array1);
change2(array2);
change3(array3);

document.getElementById('output').innerHTML = array1;
document.getElementById('output2').innerHTML = array2;
document.getElementById('output3').innerHTML = array3;