strange.rb

gistfile1.rb

foo = %w{cat dog dog cat cat cat dog cat dog dog cat cat dog dog}
bar = %w{yes no yes yes yes no no yes no yes no no yes yes}

puts "Foo: #{foo}"
puts "Bar: #{bar}"

histogram = foo.inject(Hash.new(0)) { |h,v| h[v] += 1; h }
puts histogram

j = 0
foobar = foo.inject(Hash.new([])) do |h,v|
	h[v] << bar[j]
	puts "bar[#{j}] = #{bar[j]}"
	puts "h[#{v}] = #{h[v]}"
	j += 1
	h
end

puts "foobar: #{foobar}" # {} ???????
puts "foobar['cat'] #{foobar['cat']}" # not nil!!!?!?!?!?

puts "foobar.size = #{foobar.size}" # 0 ?!?!?!?!?


j = 0
foobar = foo.inject({}) do |h,v|
	h[v] ||= []
	h[v] << bar[j]
	puts "bar[#{j}] = #{bar[j]}"
	puts "h[#{v}] = #{h[v]}"
	j += 1
	h
end

puts "foobar: #{foobar}"
puts "foobar['cat'] #{foobar['cat']}"

puts "foobar.size = #{foobar.size}"