From: "David A. Black" <dblack@...>
Date: 2008-04-29T20:16:26+09:00
Subject: Re: Sprintf: what does mean the percent symbol?

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Hi --

On Tue, 29 Apr 2008, Robert Klemme wrote:

>> I've searched on the ruby pickaxe and several other ruby books but I
>> haven't found anything on the % alone, obviously there are many use of
>> that combined with option (array: %w, string: %q,%Q, regexp: %r, ...).
>
> That's a completely different story, here % I would not call "operator"=
=20
> because it is not runtime effective.  This occurrence of the percent sign=
 is=20
> evaluated at compile time, more precisely during parsing.  All these are=
=20
> convenience syntaxes to more easily express certain literals.  For exampl=
e,=20
> if you have a regular expression containing forward slashes the %r form i=
s=20
> much easier on the eye:
>
> %r{/+} vs. /\/+/

But not the brain :-) I know there's no consensus about these things,
but I'll just put in a word for //. Having trained my brain to
understand /\/+/ at a glance, I always find it much harder to
understand things like {/+}, and similarly with /x-style regexes,
which I always have to slow down to read.

Chacun =C3=A0 son cerveau :-)


David

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