Why is my JavaScript function sometimes “not defined”?

Question

I call my JavaScript function. Why do I sometimes get the error \'myFunction is not defined\' when it is defined?

For example. I\'ll occasionally g

Answer 1

If you're changing the prototype of the built-in 'function' object it's possible you're running into a browser bug or race condition by modifying a fundamental built-in object.

Test it in multiple browsers to find out.