Tracking down WARNING: Expecting a number or something iterable, got undefined

[espruino-discuss]

Posted at 2016-03-31 by DrAzzy

What things can generate this error?

Is there any way that I can find out what line this is ocurring on? I have this coming up in my animation code seemingly at random, and I can't seem to figure out what is failing and returning undefined.

[gfwilliams]

Posted at 2016-03-31 by @gfwilliams

To be honest it could be anything - most likely is SPI/I2C write, or E.toXX... Something where you could feed in an array, string, or a number.

I guess realistically this should be an exception, and then you'd get a stack trace out of it. I'll see how easy it'd be to change.

[gfwilliams]

Posted at 2016-03-31 by @gfwilliams

Ok, just changed this - so if you try and up to date build it should now fail with a stack trace pointing you to the error