How to Generate a Random Number in JavaScript ?
Last Updated :
31 Jan, 2024
JavaScript allows us to generate random numbers using
Math.random()
method
, which return a pseudo-random floating-point number between 0 (inclusive) and 1 (exclusive).
To obtain random integers within a specific range, one often uses a combination of Math.random()
, multiplication, and rounding.
The Math.random()
method in JavaScript is a foundational function for generating pseudo-random floating-point numbers between 0 (inclusive) and 1 (exclusive).
Example: Randomly generating floating point number between 0 and 1 using the Math.round() method.
Javascript
function random()
{
let randomNumber= Math.random();
console.log(randomNumber)
}
random();
|
Using Math.floor() with Math.random() in JavaScript enables the creation of random integers within a defined range. This combination ensures a predictable outcome for applications such as games and simulations.”
Example: Randomly generating integer within a specific range using the Math.floor() method along with the Math.random() method.
Javascript
function random() {
let randomNo = Math.floor(Math.random() * 10);
console.log(randomNo);
}
random();
|
The Math.ceil()
method in JavaScript is used to round a number up to the nearest integer greater than or equal to the original value.
Example: Generating random integer using Math.ceil() along with math.random() method.
Javascript
const randomInteger = Math.ceil(Math.random() * 10);
console.log(randomInteger);
|
Using Math.round()
with Math.random()
in JavaScript allows for the generation of random integers by rounding the result of Math.random()
. This is commonly used when a fair rounding to the nearest integer is needed.
Example: The below code uses Math.round() with Math.random() to generate random number.
Javascript
const randomInteger = Math.round(Math.random() * 10);
console.log(randomInteger);
|
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