Compiled code and related error messages

[espruino-discuss]

Posted at 2015-09-19 by @allObjects

function lenc(m) {
 "compiled";
  var l = m.length(m);
  return l;
}
function len() {
  var m = "123.456";
  console.log(lenc());
}

with len() entered/run in console complains:

 1v80 Copyright 2015 G.Williams
>echo(0);
=undefined
>len()
undefined
=undefined
Uncaught Error: Expecting a function to call, got Number
 at line 3 col 21
  console.log(lenc(m));
                     ^
in function "len" called from line 1 col 5
len()
     ^
> 

I know that it should read var l = m.length; in lenc()... but I got there only after a while when my mind had let go of the deceipt by the error message and I took a closer look at lenc().

[espruino-discuss]

Posted at 2015-09-20 by asez73

Try to use the webide option 'Throttle send'...

[espruino-discuss]

Posted at 2015-09-20 by JumJum

Hi allObjects, try this ;-)

function lenc(m) {
  "compiled";
  var l = m.length; //length without (), it is not a function
  return l;
}
function len() {
  var m = "123.456";
  console.log(lenc(m)); //add m to call
}

[espruino-discuss]

Posted at 2015-09-20 by @allObjects

I posted this because to make user's aware of the fact that error messages caused in compiled code dont reference the compiled code. The reference points to the 'last' layer of interpreted code.

The error message is also different when invoking from with in an function o r invoking from the console directly:

• Error message created on invocation of compiled code within a function().

>len();
undefined
=undefined
Uncaught Error: Function not found!
 at line 3 col 20
  console.log(lenc());
                    ^
in function "len" called from line 1 col 5
len();
     ^
> 

• Error message created on diret invocation of compiled code from console.

>lenc("abc");
=undefined
Uncaught Error: Expecting a function to call, got Number
 at line 1 col 11
lenc("123.456");
           ^
> 

[espruino-discuss]

Posted at 2015-09-20 by asez73

Thank's for sharing this. I had some problems with compiled code recently and @gordon corrected the web ide... You should check that you have the last version. Furthermore I think that the compiled code can't effectively be debuged or interrupted from the command line. So you should check the dedicated page to compiling... Might have been obvious to you of course. :-)

[espruino-discuss]

Posted at 2015-09-20 by @allObjects

...compilation at upload to the board dit not complain... how could it. Therefore:

There is always a first time surprise... and it may not be the last... no even the last of the same subject! ;-)

[gfwilliams]

Posted at 2015-09-21 by @gfwilliams

Thanks for posting up - Yes, the error message is a bit confusing. I guess some explanation on the Compiler page might help...

Although it does say to write you code without "compiled" first and check it works ;) In that case it would have pointed to the correct point when the error occurred.