JavaScript Random

JavaScript Random

In this tutorial, you will learn about random() is as follows:

• The Random Method returns number between 0 (inclusive) and 1 (exclusive)
• Math.random()
• There are no parameters for  method random().

Example

Output

 

Shifting and Scaling  

The range of the values produced directly by a random variable is often different from what is needed in a specific application.

e.g., 

• Dice
• Coin Tossing

Math.floor(1+ Math.random()0*6)

Here, Math.random is multiplied with 6, so that we get a range from 0.0 6.0. This is called scaling.

Adding 1(here) to the obtained value is called shifting.

Math.floor() is used to determine the doset integer not greater than the argument value 

• E.g., Math.floor(6.75) is 6 and Math.floor(1.89) is 1

Example1- Program

 

Displaying Random Images 

Web content that varies randomly can add dynamic, interesting effects to a page.

1. alert()

2. prompt()

In Both methods has limited features in receiving input from the user

Script is often used to respond to user initiated events.