I like this suggestion. I am wondering though if the tagging should be done
by wrapping the input in a tuple:
IO.inspect([1, 2, 3], tag: “my list”)
#=> {"my list", [1, 2, 3]}
If not, we should probably just print: "my list: [1, 2, 3]".
*José Valim*
www.plataformatec.com.br
Skype: jv.ptec
Founder and Director of R&D
On Fri, Jul 15, 2016 at 11:50 AM, Michał Muskała <[email protected]> wrote:
> Hello everybody.
>
> IO.inspect/2 is one of the most useful debugging tools, and I use it
> extremely often. The ability to stick `|> IO.inspect` in pretty much every
> part of the program is really powerful. Unfortunately when having multiple
> such calls it becomes hard to distinguish which output matches which call.
> The usual way to solve this is by inspecting something like {tag_name,
> value} instead of just value, but this has the unfortunate effect of
> breaking the pipe-ability and forces you to assign things into specific
> variables.
>
> I propose we add an option to IO.inspect called tag. It would simply print
> the tag before the output. How would it look like?
>
> IO.inspect([1, 2, 3], tag: “my list”)
>
> would print:
>
> my list => [1, 2, 3]
>
> The return value would obviously not change, so it would still be a list
> [1, 2, 3] in that case. This still allows IO.inspect to be pipe-able and
> gives us easily distinguishable output at the same time. I think this would
> streamline the debugging experience and make IO.inspect even more powerful.
>
> Michał.
>
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