In general, what do you do when something goes wrong.

On several occasions, I've written some code (an action to be performed 
when something happens)
but I see nothing - I expect some output but there is none.

A typical case is an incorrect filter which returns nothing but I'd 
expected it to
return something  - the trouble is that I don't know it's the filter that 
has failed
it might be something else.

I don't know where or how to start debugging.

If it were C or JS I'd just start adding print statements at appropriate 
places printing out
variables

I guess I'd like a <$log ....> widget that did something like 
console.log(...) in Javascript
or printf in C -- just to know my code has been run.

I don't know how the code that evaluates a widget works - if a widget 
"fails" (meaning that it
breaks some rules of well-formed or something) I seem to get a silent error 
(meaning that there is no output)

It would be nice to have some kind of error tiddler - that logged silent 
errors - so I could read it
when debugging.

Do any of these things (logs, error tracing, etc.) exist?

Is there a tutorial on "How to debug a faulty TW program?"

Cheers

/Joe


On Wednesday, 9 January 2019 11:53:08 UTC+1, PMario wrote:
>
> hi,
> the dumpvariables macro may be an option
>
> https://tiddlywiki.com/#dumpvariables%20Macro
>
> -m
>

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