valeriofarias.rb

# Solution for RPCFN 2: Average arrival time for a flight
# First I create a array with the list in minutes sorted
# Then I calculate the average of this elements
# I find the index looking for the closest value. 
# using the formula: (average - item).abs to return a positive number,
# complementing with .min method to return the minimum value in array.
# With this value I search in array_in_minutes to get the index.
# Finally I use this index to show the element in the array list

require 'time'

def average_time_of_day( list )
  list = list.sort!
  array_in_minutes = list.collect{ |item| (Time.parse(item).hour * 60) + (Time.parse(item).min) }.sort!
  
  sum_in_minutes = array_in_minutes.inject(0){ |result, element| result + element } 
  average = sum_in_minutes / list.length
  
  min_value = array_in_minutes.collect{ |item| ( average - item ).abs }.min
  index_position = array_in_minutes.collect{ |item| ( average - item ).abs }.index( min_value ) 

  list[ index_position ]
end


a = ["6:41am", "6:51am", "7:01am"]
average_time_of_day(a)