Calling toString on a javascript function returns source code

Question

I just found out that when you call toString() on a javascript function, as in myFunction.toString(), the source code of that function is returned.

If y

Answer 1

You can use it to create a Web Worker from function defined in the main script:

onmessage = function(e) {
  console.log('[Worker] Message received from main script:',e.data);
  postMessage('Worker speaking.');
}

b = new Blob(["onmessage = " + onmessage.toString()], {type: 'text/javascript'})

w = new Worker(window.URL.createObjectURL(b));

w.onmessage = function(e) {
    console.log('[Main] Message received from worker script:' + e.data);
  };

w.postMessage('Main speaking.');