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Every now and then (not often) it is worthwhile to check what a compiled function actually looks like.

An easy way to do that is to use the toString method

function test(a:string): string;
  result := 'Da'+a;

Procedure TForm1.ListProc;
  console.log(test('da'));                                    //"Dada"
  asm console.log( (@test).toString() ); end;                 //lists compiled external function 'test'
  asm console.log( (this.ListProc).toString() ); end;         //lists compiled procedure TForm1.ListProc
  asm console.log( (this.@InitializeForm).toString() ); end;  //lists compiled procedure TForm1.InitializeForm

which results in


function test(a) {
   return "Da"+a;

function (Self) {
      console.log( test("da") );
      console.log( (test).toString() );
      console.log( (this.ListProc).toString() );
      console.log( (this.InitializeForm).toString() );

function (Self) {


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  • 4 weeks later...
  • Moderators

When creating webworkers, the choice is to either set up a separate project for each worker (see featured demo's), or create separate text files with the webworkers code.

Another alternative is to create workers from a string  : 

myWorker := createWorker(#"
    onmessage = function(e) {
    } ");


function createWorker(workerFunc: string) : variant;
var newworker: variant;
  const blob = new Blob([workerFunc], {type: 'application/javascript'});
  const url = URL.createObjectURL(blob);
  @newworker = new Worker(url);
  result := newworker;


hybrid coding :(

The main advantage though is that creating workers can be done in the main project, no need to switch back and forth

Note : unfortunately I don't see a possibility to use the 'toString()' method here to generate webworker strings from compiled pascal functions.


Edited :

Actually it is possible to create webworkers inline/on the fly from compiled procedures without resorting to writing js-code.

As an example the TestFunc procedure below is injected into a new Worker as compiled js. No need to specify an external worker file either.

//create a new variant
  var Dummy : variant := TVariant.CreateObject;  

//give it an anonymous function
  Dummy.TestFunc := lambda (e:variant)

    function test(a: integer): integer;
      result := inc(a);

    asm console.log((@e).data); end;
    var a:integer := 1;
    a := test(a);
    asm console.log(@a); end;

//convert function TestFunc to a string and create worker from it
  var temp: string;
  asm @temp = ((@Dummy).TestFunc).toString(); end;
  WWTry := createWorker( 'onmessage = ' + temp );

the resulting worker code :

onmessage = function (e) {
         var a = 0;

         function test(a) {
            return ++a;

         console.log((e).data);    // 'testing'
         a = 1;
         a = test(a);
         console.log(a);           // '2'

and executing worker :

//execute worker

results as expected in


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Found that after all it actually is possible to create webworkers inline/on the fly from compiled procedures without resorting to writing js-code and without having to specify an external javascript file either.

See edited previous post

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