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Date: Thu, 26 Jan 2017 14:22:45 -0700
Message-ID: <CAFMT4NriUfvzgYV8HEdGYEGJxQQ_8pFH14H8_ieszkqnBd2gkQ@mail.gmail.com>
To: Rasmus Schultz <rasmus@mindplay.dk>
Cc: Stephen Reay <php-lists@koalephant.com>, =?UTF-8?Q?Fran=C3=A7ois_Laupretre?= <flaupretre@free.fr>, 
	Sara Golemon <pollita@php.net>, PHP internals <internals@lists.php.net>
Content-Type: text/plain; charset=UTF-8
Subject: Re: [PHP-DEV] Pipe Operator v2
From: levim@php.net (Levi Morrison)

On Thu, Jan 26, 2017 at 1:56 PM, Rasmus Schultz <rasmus@mindplay.dk> wrote:
> Besides, I mean, I'm sure this has occurred to everyone, right?
>
> https://gist.github.com/mindplay-dk/4ef61fd5c0a35e5aa8fc699febb86487
>
> I personally find that this new syntax you're proposing requires a lot of
> parsing.
>
> I mean, whenever you see substr() or array_map() etc. you're intuitively
> expecting the first argument to be the first argument, right? Now you have
> to backtrack through other lines and figure out the context, or try to spot
> the $$ and count arguments to figure out which is which.

I didn't follow this. Here is the example from your gist written with
either Sara's or my proposal:

    $output = $input
        |> array_filter($$, function($n) { return $n % 2 == 0; })
        |> array_map(function($n) { return $n ** 2; }, $$)
        |> array_reduce($$, function($x, $y) { return $x + $y; })
    ;

Maybe you can explain it a bit more with this code?