JavaScript Math random() Method

The JavaScript Math.random() function gives you a random number between 0 and just under 1. You can use this number as a base to get random numbers within any range you want. Now, let's see the syntax to use the JavaScript random method along with multiple examples to easily understand how we can generate random numbers using the random method.

Syntax:

Math.random();

Parameters:

• This function does not accept any parameter.

Return Value:

The math.random() function returns a floating-point, pseudo-random number between range [0,1) , 0 (inclusive), and 1 (exclusive).

Example 1: For getting a random number between 0(inclusive) and 1(exclusive). 

let random = Math.random();
console.log("Random Number Generated : " + random);

Random Number Generated : 0.1285732818930101

Example 2: Math. random() can be used to get a random number between two values. The returned value is no lower than min and may possibly be equal to min, and it is also less than and not equal to max. For getting a random number between two values the math.random() function can be executed in the following way: 

let min = 4;
let max = 5;
let random = Math.random() * (+max - +min) + +min;
console.log("Random Number Generated : " + random);

Random Number Generated : 4.051742762637161

Example 3: Math.random() can be used to get an integer between two values. The returned value is no lower than min or it is the next integer greater than min if min isn't an integer. It is also less than but not equal to the max. For getting a random integer between two values the Math.random() function can be executed in the following way: 

let min = 4;
let max = 5;
let random = Math.floor(Math.random() * (+max - +min)) + 
             +min;
console.log("Random Number Generated : " + random);

Random Number Generated : 4

Example 4: Math.random() can be used to get an integer between a minimum and a maximum value, including not only the minimum but also the maximum. For getting a random integer between two values the Math.random() function can be executed in the following way: 

let min = 20;
let max = 60;
let random =
    Math.floor(Math.random() * (+max + 1 - +min)) + +min;
console.log("Random Number Generated : " + random);

Random Number Generated : 25

We have a complete list of Javascript Math Objects methods, to check those please go through this Javascript Math Object Complete reference article.

Supported Browsers

• Chrome 51
• Edge 15
• Firefox 54
• Safari 10
• Opera 38