count.rb

require 'json'
require 'time'

counting_hash = Hash.new(0)

line_enumerator = STDIN.each_line

line_enumerator.each do |line|
  puts line
end


line_enumerator.each do |line|
  timestamp, count_string = JSON.parse(line)
  count = Float(count_string)
  counting_hash[timestamp] += count 
end
# {
#   1514764800000 => 1,
# }

counts_by_timestamp_list = counting_hash.to_a

# [
#   [1514764800000, 1]
# ]

sorted_counts_by_timestamp_list = counts_by_timestamp_list.sort_by do |timestamp, value|
  # foo
  timestamp
end

# [
#   [1514764800000, 1]
# ]


time_count_list = sorted_counts_by_timestamp_list.map do |timestamp, count|
  time = Time.at(timestamp / 1000).utc
  time_string = time.iso8601
  [time_string, count]
end

# [
#   ["2018-06-11T00:00:00Z", 1]
# ]

list_of_lines = time_count_list.map {|array| array.join("\t") }

# [ [ "2018-06-11T00:00:00Z\t541730.0"] ]

puts list_of_lines.join("\n")