From: "F. Senault" <fred@...>
Date: 2009-02-11T07:08:57+09:00
Subject: Re: Counting Occurrences of a String in an Array

Le 10 f�vrier 2009 � 22:51, shrouded.shoyu@gmail.com a �crit :

> So, for example, my array is ["aaa", "aab", "abb", "bbb"] and I want
> to return a new array that tells me how many times "a" appears: [3, 2,
> 1, 0]

When you need to map elements of an array to another array, the method
to use is, no surprise here, map (a/k/a collect).

Now, finding the number occurences of a string inside another one can be
done in a few ways, depending on what you mean exactly.  Scan is one :

>> [ "aaa", "aab", "abb", "bbb" ].map { |x| x.scan(/a/).length }
=> [3, 2, 1, 0]

Fred
-- 
Perl already has _bless_, and we know what it does...  [it] should also
have _smite_, and we know what it should do, too.  If more languages had
_smite_ implemented, the remaining programmers would be better than the
current average.                               (Mike Andrews in the SDM)