Solve 2020 day 1 part 1 in elixir

2020/Day1/Elixir/.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

2020/Day1/Elixir/.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+day1-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

2020/Day1/Elixir/README.md

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+# Day1
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `day1` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:day1, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/day1](https://hexdocs.pm/day1).
+

2020/Day1/Elixir/input.txt

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+1429
+1368
+1661
+1687
+1593
+1495
+1565
+1500
+1635
+1845
+1645
+1999
+1415
+1054
+1930
+1774
+1405
+1993
+1757
+1623
+1675
+1665
+631
+1950
+1702
+1311
+1509
+1790
+1643
+1884
+226
+1455
+1679
+1746
+1284
+1342
+1684
+1543
+1396
+1806
+1523
+1363
+1011
+1577
+1767
+1287
+1885
+1517
+1556
+1722
+1260
+1624
+1466
+1263
+1162
+1688
+1202
+1913
+1964
+1385
+1970
+1976
+1431
+858
+1748
+1544
+1438
+1300
+1926
+1587
+1376
+1939
+1039
+1639
+1539
+1491
+1631
+1521
+1564
+1507
+1637
+1534
+1713
+1533
+1118
+1356
+2003
+282
+1079
+1837
+1259
+1941
+1836
+1903
+1433
+1467
+1027
+1441
+1048
+1742
+1087
+1872
+1476
+1657
+1361
+1182
+1494
+1529
+1822
+1444
+1330
+1514
+1723
+1432
+1683
+1997
+1443
+1474
+1932
+1504
+1313
+1765
+19
+1784
+1619
+992
+1560
+1680
+1626
+1558
+1899
+1293
+1676
+1161
+1140
+1341
+1597
+1628
+1611
+1302
+1269
+1241
+1952
+1591
+1726
+428
+1703
+1289
+1109
+1478
+1002
+1817
+1849
+1838
+1319
+1641
+583
+1920
+1453
+1411
+1870
+1763
+1469
+1646
+1719
+1213
+1462
+1545
+1682
+1711
+18
+2004
+1252
+1620
+1559
+1315
+781
+1656
+1987
+1436
+1630
+1985
+1897
+1551
+1296
+1282
+1735
+1320
+1659
+1271
+1380
+1274
+1876
+1492
+1298
+1399
+1692
+1265
+1555
+1337

2020/Day1/Elixir/lib/day1.ex

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+# iex()> Day1.load_file |> Day1.first
+
+defmodule Day1 do
+  def load_file() do
+    File.read!("input.txt")
+    |> String.split("\n", trim: true)
+    |> Enum.map(fn n -> Integer.parse(n) end)
+    |> Enum.map(fn tup -> Kernel.elem(tup, 0) end)
+  end
+
+  @spec first([Integer]) :: Integer
+  def first(input) do
+    Enum.reduce(input, 0, fn curr1, res1 ->
+      if res1 > 0 and res1 != nil do
+        res1
+      else
+        Enum.reduce(input, 0, fn curr2, res2 ->
+          if res2 > 0 and res2 != nil do
+            res2
+          else
+            if curr1 + curr2 == 2020 do
+              curr1 * curr2
+            end
+          end
+        end)
+      end
+    end)
+  end
+
+  @spec second([Integer]) :: Integer
+  def second(input) do
+    :second
+  end
+end

2020/Day1/Elixir/mix.exs

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+defmodule Day1.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :day1,
+      version: "0.1.0",
+      elixir: "~> 1.12",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

2020/Day1/Elixir/test/day1_test.exs

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+defmodule Day1Test do
+  use ExUnit.Case
+  doctest Day1
+
+  test "greets the world" do
+    assert Day1.hello() == :world
+  end
+end

2020/Day1/Elixir/test/test_helper.exs

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+ExUnit.start()