From: Adam Prescott <adam@...>
Date: 2011-06-10T22:32:23+09:00
Subject: [ruby-core:36924] Re: [Ruby 1.9 - Feature #4830] Provide Default Variables for Array#each and other iterators

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On Fri, Jun 10, 2011 at 1:28 AM, Jan Lelis <mail@janlelis.de> wrote:

> "string".gsub(/com(plex)_reg(ex)/){
>  # use $1, $2, ...
> }
>
> To get back to the original problem, I'd prefer: $item (which is -of
> course- not a global variable).
>
> PS: Since $dollar variables are rarely used anyway, lets transform them all
> into special variables :D
>

I think the ${1,2,3,...} variables match the gsub(regex, "a $1 replacement
$2 here $3").

While using $item, or any other identifier, as the implicit argument might
make some code a few characters shorter to write, what other benefits are
there? All I can see is that it adds one more thing to learn in the language
and introduces greater complexity, both for people who've never seen it, and
for scoping rules. I see nothing wrong with the explicit { |item| ... }.
It's readable, it works.

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<div class=3D"gmail_quote">On Fri, Jun 10, 2011 at 1:28 AM, Jan Lelis <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:mail@janlelis.de">mail@janlelis.de</a>&g=
t;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

<div id=3D":1ic">&quot;string&quot;.gsub(/com(plex)_reg(ex)/){<br>
 =C2=A0# use $1, $2, ...<br>
}<br>
<br>
To get back to the original problem, I&#39;d prefer: $item (which is -of co=
urse- not a global variable).<br>
<br>
PS: Since $dollar variables are rarely used anyway, lets transform them all=
 into special variables :D<br>
<div class=3D"im"></div></div></blockquote></div><br><div>I think the ${1,2=
,3,...} variables match the gsub(regex, &quot;a $1 replacement $2 here $3&q=
uot;).</div><div><br></div><div>While using $item, or any other identifier,=
 as the implicit argument might make some code a few characters shorter to =
write, what other benefits are there? All I can see is that it adds one mor=
e thing to learn in the language and introduces greater complexity, both fo=
r people who&#39;ve never seen it, and for scoping rules. I see nothing wro=
ng with the explicit { |item| ... }. It&#39;s readable, it works.</div>


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