JSFiddle - React, Tailwind, and code Playground

JavaScript

function test() {
    var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
    var n = Math.floor((Math.random() * 15));
    var tex;
    while ((tex = $.inArray(n, arr)) != -1) {
        n = Math.floor((Math.random() * 15));
    }
    return n;
}
alert(test());