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Date: Sun, 30 Aug 2020 20:48:22 +0300
Message-ID: <CA+hqhpeC3cSKRXYpz7_CDk2Y_4e_J6N8cD9i1sXixOvch+mQ=g@mail.gmail.com>
To: tyson andre <tysonandre775@hotmail.com>
Cc: Larry Garfield <larry@garfieldtech.com>, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="0000000000000d100805ae1be567"
Subject: Re: [PHP-DEV] Proposal: Adding functions any(iterable $input,
 ?callable $cb = null, int $use_flags=0) and all(...)
From: weirdan@gmail.com (Bruce Weirdan)

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On Sun, Aug 30, 2020 at 6:13 PM tyson andre <tysonandre775@hotmail.com>
wrote:

> > I like this, but I do not like the flags.  I don't think they're at all
> useful.  A lot of the other discussion in the thread seems to be needlessly
> complicating it, too.
> >
> > all() and any() only need return booleans.  Their callbacks only need
> return booleans.  That's the point.  first() makes sense to add, and it
> would return the first value that matches.
>
> What would first() return on failure? Would it throw (inefficient)?
> Would it set an optional output reference to distinguish between returning
> the value null from an iterable and the null from no matches?
>

If it took the default value as well it could return that. While it's
useful in itself it also would enable you to pass a marker object and check
the identity of that to know if no matches have been found:

$none = new stdClass;
$element = first($collection, fn($elt) => ...);
if ($element === $none) {
   // nothing found
}

-- 
  Best regards,
      Bruce Weirdan                                     mailto:
weirdan@gmail.com

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