Count instances of each member of an array

count.rb

# given an array
words = %w(duck duck goose cry baby cry)

# generate a hash that counts occurrences of each word, eg:
# {"duck"=>2, "goose"=>1, "cry"=>2, "baby"=>1} 

# Method #1
counts = Hash.new(0)
words.each { |word| counts[word] += 1 }

# Method #2
counts = words.uniq.inject({}) do |counts, word|
  counts.merge(word => words.count(word))
end