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Postings from October 2015
On Wed, Oct 7, 2015 at 10:24 AM, Dave Mitchell <davem@iabyn.com> wrote:
> I think 95% of what people actually *want* a smartmatch system for is so
> that they can write code of one of these three forms:
>
> given ($index) {
> when (undef) {...}
> when (0) {...}
> when (1) {...}
> when (INDEX_MAX) {...}
> }
>
> given ($string) {
> when (undef) {...}
> when ("foo") {...}
> when ("bar") {...}
> when (BAZ) {...}
> }
>
> given ($string) {
> when (undef) {...}
> when (/foo/) {...}
> when (/bar/) {...}
> }
>
If you are doing away with polymorphism, why squeeze these three
different semantics into a single keyword?
Why not let the programmer write what he means explicitly, rather than
implicitly on compile-time "type"? I'm sure the maintainer would prefer
(modulo obvious bikeshedding):
given ($index) {
when (undef) {...}
ncase (0) {...}
ncase (1) {...}
ncase (INDEX_MAX) {...}
}
given ($string) {
when (undef) {...}
scase ("foo") {...}
scase ("bar") {...}
scase (BAZ) {...}
}
given ($string) {
when (undef) {...}
when (/foo/) {...}
when (/bar/) {...}
}
… well, at least this maintainer would …
Eirik
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