From: Adam Shelly <adam.shelly@...>
Date: 2008-05-01T04:02:58+09:00
Subject: Re: All occurances of a character in a string

> On Sat, Apr 26, 2008 at 9:55 PM, Raghu Go <rgowka1@gmail.com> wrote:
> > Hi - I am trying to figure out the ruby way of printing all occurances
> >  of a character in a string..
> >
> >  The index method on string gives only the first occurance only.

I thought of the 'indexes' method, but that works in reverse.  So I
made my own version:

class Array
  def all_indexes val
    (0..length).map{|i|self[i]==val ? i : nil}.compact
  end
  alias :all_indicies :all_indexes
end

p 'hello world'.split('').all_indicies('l')

=> [2, 3, 9]

> >
> >  Example input string - abbccdaab
> >  desired output - 'a' = 0 6 7
> >                  'b' = 1 2 8
> >                  'c' = 3 4
> >                  'd' = 5
> >
> >  Any help greatly appreciated..

Source = 'abbccdaab'
s=Source.split('')
s.uniq.each{|v| puts "'#{v}' = #{s.all_indexes(v)*' '}"}

=> 'a' = 0 6 7
   'b' = 1 2 8
   'c' = 3 4
   'd' = 5


-Adam