Dan,
If it walks like a duck…
You make a great case why Go should have checked exceptions. If anything the Go
error handling model tries to be checked exceptions - every error should be
explicitly handled - without any of the conveniences of exceptions - common
blocks, stack traces and call stack unwinding.
> On Oct 24, 2022, at 4:52 AM, Harri L <harl...@gmail.com> wrote:
>
> Hi,
>
>>> On Friday, October 21, 2022 at 12:14:52 AM UTC+3 dple...@google.com wrote:
>>>
>>> var x0 float
>>> try {
>>> x0 = check DoSomeMath(check FetchSomething(), check ComputeSomething())
>>> } handle err {
>>> log.Info("Unable to estimate initial approximation, defaulting to 1...")
>>> x0 = 1
>>> }
>>> // code continues and does things with x
>>
>> I wanted to show what the previous block looks like with the help of the
>> current Go and some help from the err2-package (I'm the author). The Go
>> playground.
>>
>> calcSomething := func() (x0 int) {
>> defer err2.Catch(func(err error) {
>> log.Printf("Unable to estimate initial approximation: %v,
>> defaulting to 1...", err)
>> x0 = 1
>> })
>> return try.To1(DoSomeMath(try.To1(FetchSomething()),
>> try.To1(ComputeSomething())))
>> }
>> x0 := calcSomething()
>>
>> Of course, that's not exactly what you are proposing:
>>
>> This makes it easy to see what error handling will happen at any point
>> within the function, keeps the control flow linear (so that, unlike
>> defer()-based recovery, you don't have to skip ahead in the function to get
>> context before the handler makes sense - the context comes first, followed
>> by the handling code), and allows code to recover from errors without
>> aborting an entire function.
>
> I also wanted to say that the `defer` -based error handling isn't so bad when
> you are used to the defer keyword already in the Go.
>
> Best Regards,
> -Harri
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