Task from Alek

gistfile1.rb

log = [
  {time: 201202, a: 3},
  {time: 201201, y: 7},
  {time: 201201, z: 2},
  {time: 201202, b: 4},
  {time: 201202, c: 0},
  {time: 201201, x: 2}
]

log.inject([])  do |acc, item|
  idx = acc.find_index { |x| x[:time] == item[:time] }
  idx ? acc[idx].merge!(item.keep_if{ |k,v| k != :time }) : acc << item
  acc
end