JSFiddle - React, Tailwind, and code Playground

by jfriend00

HTML

<div id="results"></div>

JavaScript

var uniqueRandoms = [];
var numRandoms = 5;
function makeUniqueRandom() {
    // refill the array if needed
    if (!uniqueRandoms.length) {
        for (var i = 0; i < numRandoms; i++) {
            uniqueRandoms.push(i);
        }
    }
    var index = Math.floor(Math.random() * uniqueRandoms.length);
    var val = uniqueRandoms[index];

    // now remove that value from the array
    uniqueRandoms.splice(index, 1);

    return val;

}

for (var i = 0; i < 100; i++) {
    var rand = makeUniqueRandom();
    if (i % numRandoms == 0) {
        $("#results").append("----<br>");
    }
    $("#results").append(rand + "<br>");
}