AlphaSights Tech Test

AlphaSights tech test.rb

log = [
  {time: 201201, x: 2},
  {time: 201201, y: 7},
  {time: 201201, z: 2},
  {time: 201202, a: 3},
  {time: 201202, b: 4},
  {time: 201202, c: 0}
]
 
def collapse_entries log
  new_log = Array.new
  log.each do |entry|
    add_entry(entry, new_log)
  end
  new_log
end
 
def add_entry entry, log
  other_value = entry.select {|key, _| key != :time }
  one_record = log.select{|e| e[:time] == entry[:time]}.first
  if one_record.nil?
    one_record = {time: entry[:time]}.merge other_value
    log << one_record
  else
    one_record.merge! other_value
  end
end
 
collapse_entries log