## Intro

Sometimes you need a unique, randomly generated ID. It could be used to identify an input from a form. A randomly created number, wouldn't do the trick.With a small trick we can create a number-char combination, that is unlikely to be created twice.

## Code

var hashValue = Math.random().toString(16).slice(2);// hashValue contains the random string now

## Explanation

**Math.random()**

This creates a random number between 0 and 1.

A possible result could be:

**0.95043825801676**

**Math.random().toString(16)**

This converts the generated decimal number (

*base 10*) to a hexadecimal number (

*base 16*). So you get values, where each digit is between 0 and F (

*0123456789ABCDEF*).

0.95043825801676 in hexadecimal would be

**0.f34febf30c97f8**.

**Math.random().toString(16).slice(2)**

To get rid of everything in front of the decimal point, we just cut off the first 2 chars (

*to be exact, we tell JS to start the string at position 2*).

The result would be:

**f34febf30c97f8**