Why is JIT not enabled on devices like Espruino WiFi even if they are on the latest firmware?

I saw, that only Bluetooth enabled devices are supported. Could you explain why this is? I really would like to use this feature to speed up some computational work on the Microcontroller.
I'm currently on version 2.17 and I'm using an Espruino WiFi.
Thank you :)

It was more a case of testing and demand - I'd developed on the nRF52 chips, and nobody ever asked for it to on the STM32s so I never took the time to enable it and try it out.

I've just had a quick go at enabling it and it does seem to work ok at least on the quick examples I tried, so if you now install one of the latest cutting edge builds then it should work.

I haven't yet enabled it for the Original Espruino as that does have a slightly different processor (an M3 vs M4) as well as not enough free flash memory without removing other features.

Thank you very much. After a bit of experimenting, I'm currently trying to find out, why the following function hangs indefinitly. It's a function which scans a portion (from this.idx to this.next) of an array for a given sequence, starting at an offset using a given stepping width.

find(sequence, offset, stepping) {
        "jit";
        if (stepping === undefined) {
            stepping = 1;
        }

        if (offset === undefined) {
            offset = 0;
        }

        for (let i = this.idx + offset; i < this.next - sequence.length; i+=stepping) {
            if (this.buffer[i] !== sequence[0]) {
                continue;
            }
            
            let idx = i;

            for (let j = 1; j < sequence.length; j++) {
                if (this.buffer[i + j] !== sequence[j]) {
                    idx = -1;
                    // JIT lacks break statement
                    j = sequence.length - 1;
                }
            }

            if (idx !== -1) {
                return idx;
            }
        }

        return -1;
    }

When I run it without jit it works as expected. If the function is jitted, the application hangs without any error. Thank you for your reply

Ok, I found the mistake. "continue" is not supported. As I fixed that it worked after turning off any minification of the code. If I minify, it does somehow not work anymore but does not give me any hint why. I was finally able to shave off another 150ms from my computation, which is very good :) Thank you very much Gordon.

Great - glad it helped!

When you used break and continue, did you not get an error? For example if I do:

function j() { "jit";
   for (var i=0;i<10;i++) {
     print("Hi",i);
     continue;
   }
}

It says:

JIT SyntaxError: Got continue expected EOF
 at line 1 col 42
function j(){"jit";for(var i=0;i<10;i++){print("Hi",i);continue;}}