Int to hex string in javascript

Question

I want to convert an number (integer) to a hex string

2 (0x02) to "\x02"

or

62 (0x0062) to "\x62"

How can I do that correctly?

@KeithNicholas No, but I have a problem understanding it, there seems to be a difference between \x2 and \x02. And how can I now that 0x0062 is \x62 as string. — UpCat, Apr 17 '14 at 00:19
if you look in the duplicate link shown, there is an implementation of how to padd your hex number with however many 0s you want — Keith Nicholas, Apr 17 '14 at 00:23
Leading zeroes in hexadecimal don't make any numeric difference. 9 == 09 == 009 == 0009… ad infinitum. I think whatever service you're giving the string to is just a little bit eccentric. — Chuck, Apr 17 '14 at 00:37

score 13 · Accepted Answer · answered Apr 17 '14 at 00:08

13

You can use the to string method:

a = 64;
a.toString(16); // prints "40" which is the hex value
a.toString(8); // prints "100" which is the octal value
a.toString(2); // prints "1000000" which is the binary value

answered Apr 17 '14 at 00:08

Ibu

41,298
13
73
100

It has to be in "\x62" format. – UpCat Apr 17 '14 at 00:09
a = 64; a = '\x' + a.toString(16); – volter9 Apr 17 '14 at 00:10
you can easily concatenate that. – Ibu Apr 17 '14 at 00:10
Doesn't work with 2 as the OP explicitly required the function to return \x02 and not \x2 – Sharcoux Dec 19 '18 at 16:06

score 2 · Answer 2 · answered Apr 17 '14 at 00:18

2

Well, it's seems that you want just to concatenate the integer with \x.

If so just to like that:

var number = 62;
var hexStr = '\x' + number.toString(16);

But you have something strange about explaining.

Note: that 62 is not the same as 0x62, 0x62 would be 98.

answered Apr 17 '14 at 00:18

volter9

717
5
16

What if number = 2? hexStr would be \x2, but should be \x02 – UpCat Apr 17 '14 at 00:21
But what the difference? The value still would be 2. If you need so I'll give you the answer, but there's no difference. – volter9 Apr 17 '14 at 00:22
If I would do this in python I would get "invalid \x escape' while \x02 would be excepted, so there seems to be a difference... – UpCat Apr 17 '14 at 00:25
You're asking about JS, ok never mind. Just add `var hexStr = '\x0' + number.toString(16);` – volter9 Apr 17 '14 at 00:26

score 1 · Answer 3 · answered Apr 17 '14 at 00:16

1

var converted = "\x" + number.toString(16)

answered Apr 17 '14 at 00:16

Neel

597
4
19

Int to hex string in javascript

3 Answers3