ruby solutions to problems 1 & 2.

ruby_solutions.rb

#####################################  P1

def reverse(string)
  string.length == 0 ? "" : string[-1] + reverse(string[0..-2])
end

#####################################  P2

def tokenize(url)
  url.split(/&/).map { |i| i.split(/=/) }
end

def dict(array_of_pairs)
  array_of_pairs.inject(Hash.new{[]}) { |hash,pair| hash[pair.first] += [pair.last] ; hash }
end

def scrub!(hash)
  hash.each { |k,v| hash[k] = v.first if v.length == 1 }
end

def url_to_dict(url)
  scrub!(dict(tokenize(url)))
end

p reverse("1234")

p url_to_dict("a=1&b=2&a=hello&apple=9&apple=digital")