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April 20, 2016 20:12
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Weather Data kata in Elixir
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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 |
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defmodule Weather do | |
def print(path) do | |
File.stream!(path) | |
|> Stream.map( &extract_row_from_line/1 ) | |
|> Stream.map( &drop_unused_columns_from_row/1 ) | |
|> Enum.map( &convert_strings_to_integers/1 ) | |
|> Enum.filter( &is_day?/1 ) | |
|> Enum.reduce( &row_with_smaller_temperature_spread/2 ) | |
|> print_result | |
end | |
defp extract_row_from_line(line) do | |
String.split(line, " ", trim: true) | |
end | |
defp drop_unused_columns_from_row(row) do | |
Stream.take(row, 3) # Day, Max Temp, Min Temp | |
end | |
defp convert_strings_to_integers(row) do | |
row |> Enum.map(fn(str) -> | |
case Integer.parse(str) do | |
{int, _} -> int | |
:error -> :not_a_day | |
end | |
end) | |
end | |
defp is_day?([head | _]), do: head != :not_a_day | |
defp row_with_smaller_temperature_spread([_, max1, min1] = row1, | |
[_, max2, min2] = row2) do | |
if (max1 - min1) < (max2 - min2), do: row1, else: row2 | |
end | |
defp print_result([day, max, min]) do | |
IO.puts("Day: #{day} High: #{max} Low: #{min}") | |
end | |
end |
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Code written based on the Weather Data kata, from http://codekata.com/kata/kata04-data-munging/