From: Siep Korteling <s.korteling@...>
Date: 2008-04-26T23:20:02+09:00
Subject: Re: All occurances of a  character in a string

S2 wrote:
> S2 wrote:
> 
>> irb(main):006:1>   ret[c] = ret[c].nil? ? d : d << ret[c]
>> irb(main):007:1>   ret[c].flatten!
> 
> oh sorry, here are a few things that are not needed:
> a = "abbccdaab"
> i = 0
> ret = Hash.new
> a.scan(/./) {|c|
>   ret[c] = ret[c].nil? ? [i] : ret[c] << i
>   i = i + 1
> }
> p a
> p ret

The block form of Hash.new gets rid of the if-statement; like this:

str = "abbccdaab"
ar = str.split("")
result = Hash.new{Array.new}

ar.each_with_index do|item,index|
  result[item] = result[item]<<index
end

result.each{|k,v| puts k +  " = " + v.join(",")}

regards,

Siep
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