From: Adam Akhtar <adamtemporary@...>
Date: 2008-11-03T19:06:22+09:00
Subject: recursion and variable scope level

Hi i want to reverse a string and at the same time check if there are
any spaces using recursion. I can get the string to reverse fine but
cant detect when theres a space

heres my code

def reverse_string a_string, an_index, spaces
  spaces = true if a_string[an_index - 1].chr == ' '
  if an_index == 1
    return a_string[an_index - 1].chr
  else
    return a_string[an_index - 1].chr + reverse_string(a_string,
an_index - 1, spaces)
  end

end

and i call it like this

spaces = false
str = "hello people"
puts reverse_string str, str.length, spaces
puts "Spaces present? #{spaces}"

spaces in the end is set as false though it should be set to true. Is
this soemthing to do with variable and parameter scope?
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