Proposal: A built-in Go error check function, try

Re:Proposal: A built-in Go error check function, try by umurgdk on Wednesday June 05, 2019 @01:09AM (#20101650)

I am strongly against this. `try` seems exactly like a function yet it is not acting like a function at all. People wouldn't expecting calling a function may return from the caller. And there is a reason why golang doesn't have macros. With macros all kind of craziness would be possible, and would really difficult to read different kind of projects' code.

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Re:Proposal: A built-in Go error check function, try by gnud on Wednesday June 05, 2019 @03:31AM (#20102229)

Agreed - I thought this looked pretty reasonable, if a bit parenthesis-heavy, until I saw this example:

    func printSum(a, b string) error {
        fmt.Println(
                "result:",
                try(strconv.Atoi(a)) + try(strconv.Atoi(b)),
        )
        return nil
    }

When you nest the calls to try inside another method call, like this, the control flow really becomes obscured.

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Re:Proposal: A built-in Go error check function, try by lifty on Wednesday June 05, 2019 @02:46AM (#20102057)

I dislike this proposal for the same reason. Looks like a function but does not behave like a normal one. I personally don't mind the verbose error handling in go and I think it's clear and easy to follow.

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Re:Proposal: A built-in Go error check function, try by 0815test on Wednesday June 05, 2019 @09:06AM (#20103926)

> People wouldn't expecting calling a function may return from the caller.

Why? This is essentially the same as the reset/shift pattern in e.g. Scheme - when you call shift from within a reset call, that might cause you to return directly from that. And that is a rather well-behaved pattern which composes quite well, it's nothing like the inherent weirdness of, e.g. call/cc.

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Re:Proposal: A built-in Go error check function, try by pjmlp on Wednesday June 05, 2019 @02:06AM (#20101887)

Go kind of has macros, like everything else, Go's solution to first level features in other languages is called //go:generate.

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Re:Proposal: A built-in Go error check function, try by thisgoodlife on Wednesday June 05, 2019 @06:24AM (#20102933)

Do you think it would be better if it was called try_or_return?

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