On Oct 25, 2022, at 2:28 PM, 'Daniel Lepage' via golang-nuts
<golang-nuts@googlegroups.com> wrote:
>
> In contrast, the modern Go version buries the "normal" flow in a pile of
> error handling, and IMO is a lot harder to follow:
>
> foo, err := Foo()
> if err != nil {
> return fmt.Errorf("enforcing foo limit: %w", err)
> }
> limit, err := Limit()
> if err != nil {
> return fmt.Errorf("enforcing foo limit: %w", err)
> }
> if foo > limit {
> foo, err = DiminishFoo(foo)
> if err != nil {
> return fmt.Errorf("enforcing foo limit: %v", err)
> }
> if foo > limit {
> return fmt.Errorf("foo value %d exceeds limit %d, even after
> diminishment", foo, limit)
> }
> }
Some languages have optional types so for example you can do
foo := Foo() or { return fmt.Error("enforcing foo limit: %w", err) }
limit := Limit() or { return fmt.Errorf("enforcing foo limit: %w", err) }
if foo > limit {
...
}
If you just want to punt the error to the caller, you do
foo := Foo()?
limit := Limit()?
etc. Now this is just syntactic sugar and semantically almost
identical to what Go does. Except that err becomes a builtin.
Making it a builtin can potentially be useful as the compiler
can embed information such as which line or expression generated
the error (or passed it on) for debugging.
A function returning such a value may be declared as
fn Foo() ?typeFoo {
var foo typeFoo
...
return foo
...
return err...
}
I find this easier to read as the error handling code doesn't
overwhelm the non-error logic and the compiler can check if a
Foo() caller doesn't handle the error case and print a message.
And I find this much less odious than try ... catch ... +
compilers can't easily check if exceptions are indeed handled
without adding more boilerplate code.
Though I don't think Go authors like this style.
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