JavaScript Math random() Method

The Javascript Math.random() function is used to return a floating-point pseudo-random number between range [0,1), 0 (inclusive), and 1 (exclusive). This random number can then be scaled according to the desired range.

 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). More codes for the above method are as follows

Below is an example of the Math random() Method.

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

javascript

<script type="text/javascript">
    var random = Math.random( );
    console.log("Random Number Generated : " + random );
</script>

Output:

Random Number Generated : 0.2894437916976895

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: 

Javascript

<script type="text/javascript">
    var min=4;
    var max=5;
    var random = Math.random() * (+max - +min) + +min;
    console.log("Random Number Generated : " + random );
</script>

Output:

Random Number Generated : 4.991720937372939

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: 

javascript

<script type="text/javascript">
    var min=4;
    var max=5;
    var random =
    Math.floor(Math.random() * (+max - +min)) + +min;
    console.log("Random Number Generated : " + random );
</script>

Output:

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: 

javascript

<script type="text/javascript">
    var min=20;
    var max=60;
    var random =
    Math.floor(Math.random() * (+max + 1 - +min)) + +min;
    console.log("Random Number Generated : " + random );
</script>

Output:

Random Number Generated : 60

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:

• Google Chrome 1 and above
• Internet Explorer 3 and above
• Firefox 1 and above
• Opera 3 and above
• Safari 1 and above