one line to camelize underscore in Ruby

"foo_bar_zoo".split('_').to_enum.with_index.map{|s,i| i==0?s:s.capitalize}.reduce(:+)

and this, convenience for repeatedly.

loop do
  puts gets.split('_').to_enum.with_index.map{|s,i| i==0 s:s.capitalize}.reduce(:+)
end