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Date: Tue, 24 Jan 2017 13:53:06 -0700
Message-ID: <CAFMT4Nobqq+Gsd-d-w-=fJFz3aPzq=QtEnZrzEGchgu-WOLAdQ@mail.gmail.com>
To: Rasmus Schultz <rasmus@mindplay.dk>
Cc: =?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 Tue, Jan 24, 2017 at 12:25 PM, Rasmus Schultz <rasmus@mindplay.dk> wrote:
> Isn't `_` more generally used as a "discard" placeholder in most languages?
>
> At least in Swift, Go, Scala, Dart and C# (starting with v7) I think?
>
> I don't recall having seen it mean "fill in the blank". In what languages?
>
>
> On Fri, Jan 20, 2017 at 4:26 PM, Levi Morrison <levim@php.net> wrote:
>>
>> Oops, sorry for an email that just quotes others; mis-clicked send.
>>
>> > Last, a cosmetic suggestion : replace '$$' with '$<' (more explicit as
>> > 'input data', imo).
>>
>> If we aren't going to use `$$` I'd like to use `_` or `__` which read
>> similar to "fill in the blank" and has precedence in other languages.
>>
>> But at this stage I'd much rather focus on changing the general model
>> to what I've proposed instead of what is outlined in the RFC. I care
>> much more about the feature than the exact syntax for it.
>>
>> --
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>>
>

Scala does use it this way. It also uses it in pattern matching to
mean "match anything else" or "I don't care about this one".