Solving TimeLogger problem for chat user.

problem_statement.md

I have a time range, ex: ["02:15", "04:30"] which shows a session begin and end time.

I need to break that down by the hour. End result would be: 2: 2700 3: 3600 4: 1800

The way I thought about doing this was breaking this down into the following array: ["02:15", "03:00", "04:00", "04:15"] and getting the time difference between the elements.. ie difference between 03:00 and 02:15 which results in 2700s, etc.

Any suggestions on something better? more efficient?

solution.rb

# For an array ["02:15", "04:30"]

TimeLogger.new("2:15", "4:30").hourly_breakdown # =>  {"2" => "2700", "3" => "3600", "4" => "1800}

time_logger.rb

require 'time'

class TimeLogger
  def initialize(start_time, end_time)
    @start_time = Time.parse(start_time)
    @end_time = Time.parse(end_time)
  end

  def hourly_breakdown
    output = {}
    start_hour.upto(final_hour) do |hr|
      output[hr.to_s] = minutes_of_hour(hr)
    end
    output
  end

private
  def start_hour
    @start_time.hour
  end

  def final_hour
    @end_time.hour
  end

  def minutes_of_hour(hr)
    if (hr == start_hour)
      (60 - @start_time.min) * 60
    elsif (hr == final_hour)
      (60 - @end_time.min) * 60
    else
      3600
    end
  end
end