40 lines
931 B
Elixir
40 lines
931 B
Elixir
Mix.install([
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{:flow, "~> 1.2.4"},
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{:ex_cldr_collation, "~> 0.7.2"}
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])
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defmodule Brc do
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require Logger
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def run(path) do
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for {city, [min, max, mean]} <- parse_file(path) do
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"#{city}=#{min}/#{max}/#{Float.round(mean, 1)}"
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end
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|> Enum.sort(Cldr.Collation)
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|> Enum.join(",")
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|> then(fn out -> "{" <> out <> "}" end)
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|> IO.puts()
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end
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def parse_file(path) do
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Logger.info("parse file #{path}")
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File.stream!(path)
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|> Flow.from_enumerable()
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|> Flow.map(&parse_line/1)
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|> Flow.partition()
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|> Flow.reduce(fn -> %{} end, fn {city, temp}, acc ->
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Map.update(acc, city, [temp, temp, temp], fn [prev_min, prev_max, mean] ->
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[min(prev_min, temp), max(prev_max, temp), (mean + temp) / 2]
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end)
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end)
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end
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def parse_line(line) do
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[city, temp] = String.trim(line) |> String.split(";")
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{city, String.to_float(temp)}
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end
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end
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Brc.run("./priv/data.txt")
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