From: Tim Hunter <TimHunter@...>
Date: 2009-02-11T07:09:27+09:00
Subject: Re: Counting Occurrences of a String in an Array

shrouded.shoyu@gmail.com wrote:
> Hi,
> 
> I'm pretty new to Ruby, and I've been trying to figure out the best
> way to do this with little luck.
> 
> I have an array that is all strings, and I need to count, for each
> string in the array, how many times some substring appears in it.
> 
> 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]
> 
> Can anyone point me in the right direction with this?
> 
> Thanks!
> 
> 

Looks like a job for collect:

irb(main):008:0> a = ["aaa", "aab", "abb", "bbb"]
=> ["aaa", "aab", "abb", "bbb"]
irb(main):009:0> a.collect {|v| v.scan(/a/).size}
=> [3, 2, 1, 0]



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