Random Number Generator

[Rhane]

I am looking to create a 4 digit random number generator for a variable. Is there a specific variable type I should use? Right now I have single line variable and when I put the below script in the default value, it generates the number but there is a decimal behind it.
javascript: Math.round(Math.random()*9000) + 1000;

Could anyone answer how to truncate the decimal and what is behind that? Or if there is an easier way to make a random integer pop up in a variable?

Thanks in advance.

[justin_drysdale]

I originally said use Math.floor(), however Math.round() should have the same truncating qualities. I tested your code and didnt have anything appearing to the right of the decimal point. If your code still doesn't work, you can always use parseInt on the result.

[Rhane]

Modified the script and went with...

javascript: Math.floor(Math.random() * 9000).toFixed(0);

this seemed to of worked.

[justin_drysdale]

I would add 1 to offset Math.floor and to get a truly random (as random as js can be) number. It is always rounding down... without the +1 you would never hit the max number of the range. Probably not a big deal.

Math.floor((Math.random() * 9000) + 1).toFixed(0);

[lewgrantweber]

I'm trying to generate random numbers in the process of generating passwords.

Math.random() does not produce cryptographically strong results (see Math.random() - JavaScript | MDN)

window.crypto.getRandomValues() is used in browsers but doesn't appear to be available server-side in servicenow. Is there some other built-in source for strong random numbers for servicenow server-side scripts? What about other crypto services like hashing?

Cheers,

Lew