Readme.md

How to run the test file

1. First move the two files in to the same directory on to your system.

2. Then install the gems 'minitest' and 'purdytest' with:

$ gem install 'minitest'
$ gem install 'purdytest'

3. Run the test file from within the directory the ruby files are in.

ruby test_largert_storm_events.rb`.

If you have any questions leave them in the comments below. If you include an @kpearson I'll get a notification.

largest_storm_events.rb

require "CSV"

class LargestStormEvents
  attr_reader :file, :clean_data, :event_range

  def initialize file
    @file = file
    @clean_data = data_cleaner file
  end

  def events_in_date_range time1, time2
    date_time_range time1, time2
    clean_data.select { |row| in_time_range? row }
  end

  private

  def csv_reader file
    CSV.read(file, headers: true, :header_converters => :symbol).map(&:to_hash)
  end

  def data_cleaner file
    elements = ["A", "B", "C"]
    cz_name_filtered = filter_data(csv_reader(file), elements, :cz_name)
    filter_data(cz_name_filtered, elements, :tor_other_cz_name)
  end

  def in_time_range? event
    event_range === event_time(event)
  end

  def date_time_range(start, finish)
    @event_range = parse_date_time(start)..parse_date_time(finish)
  end

  protected

  def event_time event
    event_date = event[:begin_date_time] + "-#{offset(event[:cz_timezone])}:00"
    parse_date_time event_date
  end

  def parse_date_time date
    DateTime.parse(date).to_time
  end

  def offset number
    number.size == 1 ? "0#{number}" : number
  end

  def filter_data(data, elements, field)
    data.reject { |row| elements.include? row[field][0] if row[field] }
  end
end

test_largert_storm_events.rb

require "minitest/autorun"
require 'purdytest'
require "./largest_storm_events.rb"

class TestLargestStormEvents < Minitest::Test

  @@storm_event = LargestStormEvents.new("2015_c20160810.csv")

  def test_clean_data
    assert_equal 45089, @@storm_event.clean_data.count
  end

  def test_events_in_date_range
    start_date = "1-JUNE-15 00:00:00+05:00"
    end_date   = "31-DEC-15 00:00:00+05:00"
    assert_equal 25047, @@storm_event.events_in_date_range(start_date, end_date).size
  end
end