JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = [1, 2, 2, 3, 1, 3];
var newarr = [];
$.each(arr, function (index, element) {
    if ($.inArray(element, newarr) < 0) newarr.push(element);
});

alert(newarr[0]);
alert(newarr[1]);
alert(newarr[2]);