How to randomly generate numbers without repetition in javascript?

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I want to generate each number between 0 to 4 randomly using javascript and each number can appear only once. So I wrote the code:

for(var l=0; l<5; l++) {
    var randomNumber = Math.floor(Math.random()*5);  

but this code is repeating the values. Please help.

Generate a range of numbers:

var numbers = [1, 2, 3, 4];

And then shuffle it:

function shuffle(o) {
    for(var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
    return o;

var random = shuffle(numbers);

How to randomly generate numbers without repetition in javascript , isn't in the array yet, push it into the array. Function in Javascript for you to generate random numbers with Javascript without repetition. For this you will need an Array with numbers that can be generated "randomly". var numbers = [1, 2, 3, 4];

One more way to do it:

for (var a = [0, 1, 2, 3, 4], i = a.length; i--; ) {
    var random = a.splice(Math.floor(Math.random() * (i + 1)), 1)[0];

Don't know if it's even possible to make it more compact.


Here is embed demo:

$('button').click(function() {
    for (var a = [0, 1, 2, 3, 4], i = a.length; i--; ) {
        var random = a.splice(Math.floor(Math.random() * (i + 1)), 1)[0];
        $('.output').append('<span>' + random + '</span>');
.output span {
    display: inline-block;
    background: #DDD;
    padding: 5px;
    margin: 5px;
    width: 20px;
    height: 20px;
    text-align: center;
<script src=""></script>
<div class="output"></div>

How to Generate Random Numbers in Javascript Without Repetitions, Generate a range of numbers: var numbers = [1, 2, 3, 4];. And then shuffle it: function shuffle(o) { for(var j, x, i = o.length; i;� Random Sequence Generator. This form allows you to generate randomized sequences of integers. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs.

The answers given by Adil and Minko have a major problem (although Minko at least constrained it to a small set of numbers): They go over the same numbers over and over again.

In that sense, a better method would be to create the array containing the possible values, shuffle it and then just pop elements off of it. This will require the complexity of shuffling the array, but it will get rid of the problem mentioned above.

var elements = [1, 2, 3, 4];
elements.shuffle(); // not a standard Javascript function, needs to be implemented

while( elements.length > 0 ) {
    console.log( elements.pop() );

Generating an array of random numbers without repetition, In this video, you will learn how to generate random numbers in javascript without repetitions Duration: 5:30 Posted: Oct 7, 2019 Generate unique random numbers with formulas . To generate the unique random numbers in Excel, you need to use two formulas. 1. Suppose you need to generate random numbers without duplicates into column A and column B, now select cell E1, and type this formula =RAND(), then press Enter key, see screenshot: 2.

Appreciate all your help. But probably another way to generate random number in a given max range can be implemented as per below.

function generateRan(){
    var max = 20;
    var random = [];
    for(var i = 0;i<max ; i++){
        var temp = Math.floor(Math.random()*max);
        if(random.indexOf(temp) == -1){


How to generate random numbers without repetition using , What's an array? Javascript provides a data structure that is used to store multiple values of the same/different datatypes in a single variable. Generate one or more random number or random letter sets from a range of numbers or letters. The random numbers or letters will be the random sample set. For Sample Size enter the value for the number of samples you need. For the Sample Range enter the range of

function getRanArr(lngth) {
  let arr = [];
  do {
      let ran = Math.floor(Math.random() * lngth); 
      arr = arr.indexOf(ran) > -1 ? arr : arr.concat(ran);
   }while (arr.length < lngth)
   return arr;

const res = getRanArr(5);


Generate Non-Repeating Random Number From A Set, How do I generate random numbers without repetition using switchcase in JavaScript? Generate 10 Unique Random Numbers between 1 to 10 in javascript. 1. How to randomly generate numbers without repetition in javascript? See more linked questions.

Prevent repetitive random numbers, I am trying to generate a random number from a set of numbers but it does not seem to be working. Basically what I did was I randomly� There are many ways to generate random unique numbers. But I will mention three ways to achieve this. * Worst way possible [code]function DistinctRandomNumberGenerator(min, max) { min = Number(min) || 0; max = Number(max) || 10; var keyTracker

[Solved] How to generate non-repeating numbers in Javascript , Prevent repetitive random numbers � javascript random. Is this a good way to prevent two sequential numbers from repeating, or is there a better,� The seed is a number that controls whether the Random Number Generator produces a new set of random numbers or repeats a particular sequence of random numbers. If the text box labeled "Seed" is blank, the Random Number Generator will produce a different set of random numbers each time a random number table is created. On the other hand, if a

How to get a random number without duplicate digits in JavaScript , indexOf(randomItem); //this will delete the actual array element if (index > -1) { myArray.splice(index, 1); } } //this function gets a random value� Following program generates 10 random, non-repetitive integers between 1 to 100. It generates a random integer in the given interval and adds it in a list if it is not previously added.

  • Duplicate:…
  • Posted this at the same time. +1 for a more stable method.
  • The second line in the script above should be changed to var random = a.splice(Math.floor(Math.random() * i), 1)[0]; The splice function uses zero-based index so with array length of 5 as above the calculated index could be 5 as well and the a array doesn't have a[5].
  • Please indent so it all shows up as one block of code. Explaining your code might also make this a better answer.
  • i dont understand what are you saying?