On Mon, Feb 11, 2019 at 11:35 AM Levi Morrison <le...@php.net> wrote:
> >> I recognize that there is one downside, which is that lazy evaluation
> >> is lost, but generally don't see it to be an issue in these specific
> >> cases.
> >>
> > Lazy evaluation doesn't have to be lost if the all_of and any_of
> functions are written correctly. all_of will return false as soon as one of
> them fails, and any_of will return true as soon as one of them passes.
> >
> > Unless you are talking about cases like this:
> > if(is_numeric(reallyFastFunc($foo)) || is_numeric(reallySlowFunc($bar)))
> > In that case, you might be able to short circuit the evaluation of
> reallySlowFunc($bar), which wouldn't be the case with
> > if(any_of('is_numeric',reallyFastFunc($foo),reallySlowFunc($bar))){}
>
> Yes, this is what I was referring to. As previously stated, I don't
> think it's likely to be an issue. If it is, then as you stated the
> normal boolean logic can be used in such places.
>
> -----
>
> In other words, nothing needs to be done in PHP itself. Just write or
> use someone else's `all_of`, `any_of`, `none_of`, etc, functions.
>
> I'm sure there would be performance enhancement by having it handled with
C vs PHP. I would guess you'd probably need to implement separate functions
for each is_* variant though: any_numeric, all_numeric, none_numeric,
any_boolean, all_boolean, none_boolean, etc. You could probably still have
the any_of, all_of, none_of versions as a shortcut though. I'm speaking
from a point of some ignorance though in terms of what is and isn't faster
when done in C.
Whether it needs to be in core/bundled extension is another debate though.
Seems like it might be a good thing for someone wanting to learn to write
extensions to get their feet wet with, though. I did something similar when
I wanted to try out writing an extension. I implemented a left($str,$len)
and right($str,$len) method... which are basically just shortcuts for
substr*.. but gave me some experience with all of the boiler plate needed,
as well as utilizing existing functions.
*left($str,$len) => substr($str,0,$len)
right($str,$len) => substr($str,-$len);
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-- Chase
chasepee...@gmail.com
