Proposal: Add Go 1.13 error handling to Error section

[ngfgrant]

Hi thanks for this super site.

I am going through it line by line at the moment and wondered if it would be worth making an addition to the existing Error page? Specifically, the new %w, Unwrap, Is and As methods in error. I don't think the new methods should replace the existing content, only compliment it.

I am happy to contribute the example should this idea be accepted.

[eliben]

I think it's a good idea in general, but the devil is in the details. Wrapping errors is a power use, but gobyexample tries to stick to simpler concepts. Detailed discussion can take over a concrete PR, I just wanted to provide some background.

[Omid-SH]

Hi, I have prepared an answer to the problem, raised in the link below. Hope you enjoy it :)
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[eliben]

@Omid-SH consider submitting a PR with a simple example to this repository. That will be easier to review.

[guettli]

Yes, the page about errors could be improved.

I am missing sentinel errors. We use them a lot and use errors.Is() often.

The current state seems to be: Waiting for PR. I hope I can provide one during the next days.

[guettli]

I created PR #517 which adds modern error handling. Please take a look. Feel free to take the PR and adapt it the way you want. Sometimes this is easier than telling me what I should change.