I need a way of getting a signed 8-bit integer from a hexadecimal value using JavaScript. So far I have tried using parseInt(value, 8) but it seems to be deprecated and I get parseInt(0xbd, 8) = 0 (when it's supposed to give -67).
How can I do this?
I was just searching for a solution to this in javascript. The answer from splig does not seem correct, but it lead me to the solution.
I believe you should be subtracting 256 from num when (num > 127).
var num = parseInt('ff', 16);
if (num > 127) { num = num - 256 }
alert(num);The second parameter of parseInt is the radix, you need 16 as it's hex because you've told it it's hex the 0x is optional.
As you're wanting to do an 8 bit signed int you'll need convert it to signed manually - try something like
var num = parseInt('bd', 16);
if (num > 127) { num = 128 - num }
alert(num);
