In this article we will see how to generate random numbers and alpha-numeric numbers in JavaScript We will use JavaScript Math.random function to generate random numbers.
Math.random function returns a floating-point, pseudo-random number in the range [0, 1) that is, from 0 (inclusive) up to but not including 1 (exclusive), which you can then scale to your desired range.
Please see the below function.
1. Get random numbers
//get random numbers
function getRandomNumber() {
var max = 10;
var randomnumber = Math.floor(Math.random()*max)
return randomnumber;
}
2. Get random numbers between minimum and maximum range
//get random numbers between minimum and maximum range
function getRandomNumber() {
var min = 10;
var max = 20;
var randomnumber = Math.floor((Math.random()*(max - min + 1))+min);
return randomnumber;
}
3. Get random numeric numbers of given length
//get random numeric numbers
var numbers = '0123456789';
var length = 5;
function getRandomNumbericNumbers() {
var result = '';
for (var i = length; i > 0; --i)
result += numbers[Math.round(Math.random() * (numbers.length - 1))];
return result;
}
4. Get random alpha-numeric numbers of given length
//get random alpha-numeric numbers
var characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
var length = 10;
function getRandomAlphaNumbericNumbers() {
var result = '';
for (var i = length; i > 0; --i)
result += characters[Math.round(Math.random() * (characters.length - 1))];
return result;
}
5. Get random alpha-numeric numbers of length between minimum and maximum range
//get random alpha numeric numbers
var characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
var minLength = 5;
var maxLength = 10;
function getRandomAlphaNumbericNumbers() {
var length = Math.floor((Math.random()*(maxLength - minLength + 1))+minLength);
var result = '';
for (var i = length; i > 0; --i)
result += characters[Math.round(Math.random() * (characters.length - 1))];
return result;
}
