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Last active Jan 13, 2017

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Kata04: Data Munging - Part One: Weather Data http://codekata.com/kata/kata04-data-munging/

In weather.dat you’ll find daily weather data for Morristown, NJ for June 2002. Download this text file, then write a program to output the day number (column one) with the smallest temperature spread (the maximum temperature is the second column, the minimum the third column).

http://codekata.com/kata/kata04-data-munging/

Dy MxT MnT AvT HDDay AvDP 1HrP TPcpn WxType PDir AvSp Dir MxS SkyC MxR MnR AvSLP
1 88 59 74 53.8 0.00 F 280 9.6 270 17 1.6 93 23 1004.5
2 79 63 71 46.5 0.00 330 8.7 340 23 3.3 70 28 1004.5
3 77 55 66 39.6 0.00 350 5.0 350 9 2.8 59 24 1016.8
4 77 59 68 51.1 0.00 110 9.1 130 12 8.6 62 40 1021.1
5 90 66 78 68.3 0.00 TFH 220 8.3 260 12 6.9 84 55 1014.4
6 81 61 71 63.7 0.00 RFH 030 6.2 030 13 9.7 93 60 1012.7
7 73 57 65 53.0 0.00 RF 050 9.5 050 17 5.3 90 48 1021.8
8 75 54 65 50.0 0.00 FH 160 4.2 150 10 2.6 93 41 1026.3
9 86 32* 59 6 61.5 0.00 240 7.6 220 12 6.0 78 46 1018.6
10 84 64 74 57.5 0.00 F 210 6.6 050 9 3.4 84 40 1019.0
11 91 59 75 66.3 0.00 H 250 7.1 230 12 2.5 93 45 1012.6
12 88 73 81 68.7 0.00 RTH 250 8.1 270 21 7.9 94 51 1007.0
13 70 59 65 55.0 0.00 H 150 3.0 150 8 10.0 83 59 1012.6
14 61 59 60 5 55.9 0.00 RF 060 6.7 080 9 10.0 93 87 1008.6
15 64 55 60 5 54.9 0.00 F 040 4.3 200 7 9.6 96 70 1006.1
16 79 59 69 56.7 0.00 F 250 7.6 240 21 7.8 87 44 1007.0
17 81 57 69 51.7 0.00 T 260 9.1 270 29* 5.2 90 34 1012.5
18 82 52 67 52.6 0.00 230 4.0 190 12 5.0 93 34 1021.3
19 81 61 71 58.9 0.00 H 250 5.2 230 12 5.3 87 44 1028.5
20 84 57 71 58.9 0.00 FH 150 6.3 160 13 3.6 90 43 1032.5
21 86 59 73 57.7 0.00 F 240 6.1 250 12 1.0 87 35 1030.7
22 90 64 77 61.1 0.00 H 250 6.4 230 9 0.2 78 38 1026.4
23 90 68 79 63.1 0.00 H 240 8.3 230 12 0.2 68 42 1021.3
24 90 77 84 67.5 0.00 H 350 8.5 010 14 6.9 74 48 1018.2
25 90 72 81 61.3 0.00 190 4.9 230 9 5.6 81 29 1019.6
26 97* 64 81 70.4 0.00 H 050 5.1 200 12 4.0 107 45 1014.9
27 91 72 82 69.7 0.00 RTH 250 12.1 230 17 7.1 90 47 1009.0
28 84 68 76 65.6 0.00 RTFH 280 7.6 340 16 7.0 100 51 1011.0
29 88 66 77 59.7 0.00 040 5.4 020 9 5.3 84 33 1020.6
30 90 45 68 63.6 0.00 H 240 6.0 220 17 4.8 200 41 1022.7
mo 82.9 60.5 71.7 16 58.8 0.00 6.9 5.3
# Weather reader
class Weather
WeatherRecord = Struct.new :day, :max, :min do
def spread
max - min
end
end
def initialize(file)
@weather_records = File.readlines(file).collect do |line|
_, day, max_temp, min_temp = line.split(/\s+/)
next if day.to_i.zero?
WeatherRecord.new day.to_i, max_temp.to_i, min_temp.to_i
end.reject(&:nil?)
end
# Find the day number with the smallest temperature spread
def day_with_smallest_temp_spread
@weather_records.min_by(&:spread).day
end
end
require_relative 'weather'
require 'test/unit'
# general task test
class WeatherTest < Test::Unit::TestCase
def test_day_with_smallest_temp_spread
weather = Weather.new 'weather.dat'
assert_equal(14, weather.day_with_smallest_temp_spread)
end
end
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