JavaScript Random

JavaScript have a Random number function. The method can generate a number in a specific range. The number can not be reasonably be predicted.


JavaScript Random Integers

Math.random() always returns a number lower than 1.

Use Math.random() and Math.floor() to return random integers in a range.



// Return random integers from 0 to 10
Math.floor(Math.random() * 11);
 
// Return random integers from 0 to 100
Math.floor(Math.random() * 101); 
 
// Returns random integers from 1 to 10
Math.floor(Math.random() * 10) + 1;
 
// Return random integers from 1 to 100
Math.floor(Math.random() * 100) + 1; 

Learn more about JavaScript Numbers Learn more about JavaScript Numbers Methods

JavaScript Random Function

Create a random function for all random integer purposes.
JS JavaScript - JavaScript Random Function

// The JavaScript function return random numbers between min (included) and max (excluded)
function getRandomInteger(min, max) {
return Math.floor(Math.random() * (max - min) ) + min;
}
 
// The JavaScript function return random numbers between min and max (both included)
function getRandomInteger(min, max) {
return Math.floor(Math.random() * (max - min + 1) ) + min;
}

Learn more about JavaScript Functions

Math.random() does not provide cryptographically secure random numbers. Do not use them for anything related to security. Use the Web Crypto API instead, and more precisely the window.crypto.getRandomValues() method.


JavaScript Crypto GetRandomValues

The Crypto.getRandomValues() method lets you get cryptographically strong random values. The array given as the parameter is filled with random numbers (random in its cryptographic meaning).

JS JavaScript - JavaScript Crypto GetRandomValues

/* assuming that window.crypto.getRandomValues is available */
var array = new Uint32Array(10);
window.crypto.getRandomValues(array);
 
console.log("Your lucky numbers:");
for (var i = 0; i < array.length; i++) {
    console.log(array[i]);
}

Learn more about JavaScript Variables Learn more about JavaScript Comments
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JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.


The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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