"compiled"; Error: NewExpression is not implemented yet

[espruino-discuss]

Posted at 2018-10-02 by Robin

Mon 2018.10.01

Just attempted "compiled"; just after the function name line inside a class, as in the example.

https://www.espruino.com/Compilation

How do I use it?
Simply get your function working as you want it to,
and then add the string "compiled"; to the very front of it:

foo(a,b) {
  "compiled";

}

But am faced with:

1v99 (c) 2018 G.Williams
>WARNING: Function marked with "compiled" uploaded in source form
---------------------------------------------------
                                 COMPILER MESSAGE
---------------------------------------------------
Error: NewExpression is not implemented yet
---------------------------------------------------
=undefined
>

Is this supported for class functions?

1v99 on an authentic Pico

EDIT Tue 2018.10.02

After many divide and conquer attempts;

"NewExpression" seems to refer to:

var ary = new Uint8ClampedArray(16);

and not "compiled"; despite the function actually working as expected.

[espruino-discuss]

Posted at 2018-10-02 by @allObjects

Works as designed and implemented... AND as documented on page https://www.espruino.com/Compilation :

JavaScript Compilation

• ...
• What works and what doesn't?
  • Works
    • ...
  • Doesn't Work
    - Creating objects with new
    - ...

New is not implemented for various reasons...

[espruino-discuss]

Posted at 2018-10-03 by Robin

Wed 2018.10.03

Too many Windows containing reference documentation open and observed the contents under the wrong Caveats heading.

Good catch @allObjects

[gfwilliams]

Posted at 2018-10-03 by @gfwilliams

I should add that the process of creating typed arrays can be quite slow (as Espruino has to search for a contiguous area of free memory) so if you want to get the best performance out of compiled code you're best off allocating them once, when the device initialises.