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List:       perl6-language
Subject:    Fwd: Counting characters
From:       Carl_Mäsak <cmasak () gmail ! com>
Date:       2010-01-27 13:33:03
Message-ID: 16d769b71001270533m14648ab9y2aab52f1ac75a4cd () mail ! gmail ! com
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Hm, lost p6l along the way. Forwarding.

---------- Forwarded message ----------
From: Carl Mäsak <cmasak@gmail.com>
Date: Wed, Jan 27, 2010 at 2:31 PM
Subject: Re: Counting characters
To: Moritz Lenz <moritz@faui2k3.org>


Moritz (>), Carl (>>):
>> How is "character counting" done in Perl 6?
>>
>> In Perl 5, it is `scalar tr/CG//` if I want to count the number of Cs
>> plus the number of Gs in a string.
>
> +$str.comb(/<[GC]>/)
>
> Probably not as efficient as in Perl 5, though

Heh, the thought about .comb seemed to occur to a lot of people
(including me) at the same time. Thanks. :)

Recognizing a lone character class inside a literal regex in a comb
call whose result gets immediately numified sounds to me like an
excellent use case for a sufficiently cunning optimizer. :)

// Carl

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