JSFiddle - React, Tailwind, and code Playground

HTML

<ol id="items"></ol>

JavaScript

var list = [];

function addItem(index) {
    list[index] = { idx : index };
}

var insertOrder = [ 8, 1, 9, 2, 10, 3, 11, 4, 12, 5, 13, 6, 14, 7, 15 ];

for ( var i = 0; i < 15; i++ ) {
    addItem(insertOrder[i]);
}

for(var item in list) {
    $("#items").append("<li>" + list[item].idx + "</li>");
}