How to convert decimal to hexadecimal in JavaScript

Question

How do you convert decimal values to their hexadecimal equivalent in JavaScript?

Answer 1

As the accepted answer states, the easiest way to convert from decimal to hexadecimal is var hex = dec.toString(16). However, you may prefer to add a string conversion, as it ensures that string representations like "12".toString(16) work correctly.

// Avoids a hard-to-track-down bug by returning `c` instead of `12`
(+"12").toString(16);

To reverse the process you may also use the solution below, as it is even shorter.

var dec = +("0x" + hex);

It seems to be slower in Google Chrome and Firefox, but is significantly faster in Opera. See http://jsperf.com/hex-to-dec.