On Aug 16, 7:50 am, JoJo <tokyot...@gmail.com> wrote:
> I think I figured it out. The callback must not have parentheses.
> FAIL:    onUpdate: someFunction();
> GOOD: onUpdate: someFunction;
> I have no idea why.  I am a beginner to JS.
Because "onUpdate: someFunction()" means "Call 'someFunction' and make
its return value the value of 'onUpdate'", whereas
"onUpdate:someFunction" means "Make the function 'someFunction' the
value of 'onUpdate'".

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