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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>
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>