---
title: Javascript Random
description: "## Math.random() `Math.random()` returns a random number between 0 (inclusive),  and 1 (exclusive): ### Example `Math.random(); // returns a random number` `Math.random()` always returns a number lower than 1. --- ## JavaScript Random Integers `Math.random()` used with `Math.floor()` can be used to return random integers.…"
url: "https://apprentice.mn/docs/javascript-random/"
updated: "2021-05-13"
category: Javascript
---

# Javascript Random

## Math.random()

`Math.random()` returns a random number between 0 (inclusive),  and 1 (exclusive):

### Example

      `Math.random();              // returns a random number`

`Math.random()` always returns a number lower than 1.

---

## JavaScript Random Integers

`Math.random()` used with `Math.floor()` can be used to return random integers.

### Example

      `Math.floor(Math.random() * 10);     // returns a random integer from 0 to 9`

### Example

     `Math.floor(Math.random() * 11);      // returns a random integer from 0 to 10`

### Example

     `Math.floor(Math.random() * 100);     // returns a random integer from 0 to 99`

### Example

     `Math.floor(Math.random() * 100);     // returns a random integer from 0 to 99`

### Example

     `Math.floor(Math.random() * 101);     // returns a random integer from 0 to 100`

### Example

     `Math.floor(Math.random() * 10) + 1;  // returns a random integer from 1 to 10`

### Example

     `Math.floor(Math.random() * 100) + 1; // returns a random integer from 1 to 100`

## A Proper Random Function

As you can see from the examples above, it might be a good idea to create a proper random function to use for all random integer purposes.

This JavaScript function always returns a random number between min (included) and max (excluded):

### Example

      `Math.floor(Math.random() * 10) + 1;  // returns a random integer from 1 to 10`

This JavaScript function always returns a random number between min and max (both included):

### Example

      `function getRndInteger(min, max) {
  return Math.floor(Math.random() * (max - min + 1) ) + min;
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