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Generate random number within a range in JavaScript

Generate random number within a range in JavaScript?

This article will describes you how to generate a random number by using JavaScript. A number whose outcome is unpredictable and generated by a process is called Random Number. By using the function Math.random(), we can achieve this number. Sometimes, we need to generate a random number between a range. Math.random() function generates floating numbers between 0 and 1.

Method

Math.random() function: It returns a pseudo-random number between range 0 and 1. It can be scaled the random number between the desired range.

Here, is a simple program to do so to generate the random number between a range by using the in-built function Math.random().

Let's take an example:

<!DOCTYPE html> 
<html> 
<head> 
<title>How to generate random number within a range in JavaScript? </title> 
</head> 
<body> 
	<script> 
// Function to generate random number 
function randomNumber(min, max) { 
	return Math.random() * (max - min) + min; 
} 
document.write("Random Number between 1 and 10: ") 
// Function call 
document.write( randomNumber(1, 10) ); 
</script>								 
</body> 
</html>
Output:


Math.floor() function: The Math.floor() function helps you to round off the number to its nearest integer towards the lesser value.

Let's take an example:

<!DOCTYPE html> 
<html> 
<head> 
<title>How to generate random number within a range in JavaScript? </title> 
</head> 
<body> 
<script> 
// Function to generate random number 
function randomNumber(min, max) { 
	return Math.floor(Math.random() * (max - min) + min); 
} 
document.write("Random Number between 1 and 50: ") 
// Function call 
document.write( randomNumber(1, 50) ); 
</script>									 						 
</body> 
</html>
Output:



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