Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:111729
MIME-Version: 1.0
References: <DM6PR07MB66188EBF51D1BED2560BC889F9530@DM6PR07MB6618.namprd07.prod.outlook.com>
 <7d91bd8f-9ca0-4e62-886b-f89bc8edd3e9@www.fastmail.com> <DM6PR07MB6618BABC51E35894FD2C22A7F9500@DM6PR07MB6618.namprd07.prod.outlook.com>
 <CA+hqhpeC3cSKRXYpz7_CDk2Y_4e_J6N8cD9i1sXixOvch+mQ=g@mail.gmail.com>
In-Reply-To: <CA+hqhpeC3cSKRXYpz7_CDk2Y_4e_J6N8cD9i1sXixOvch+mQ=g@mail.gmail.com>
Date: Sun, 30 Aug 2020 21:01:42 +0300
Message-ID: <CA+hqhpcaLn=FUpFXOTi-rjH+By-fxDsgDO8hTYXH_iU904AsKg@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="000000000000b6616705ae1c145d"
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)

--000000000000b6616705ae1c145d
Content-Type: text/plain; charset="UTF-8"

> 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
> }
>

Of course it should have been `$element = first($collection, fn($elt)
=>..., $none);`

-- 
  Best regards,
      Bruce Weirdan                                     mailto:
weirdan@gmail.com

--000000000000b6616705ae1c145d--