ruby solution for converting url into dictionary

hash_url.rb

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.map { |k,v| hash[k] = v.first if v.length == 1 }
  hash
end

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

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