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minmaxlist

0.0.2
0.0.7 0.0.6 0.0.5 0.0.4 0.0.3 0.0.2 0.0.1

Elixir library extending `Enum.min_by/2`, `Enum.max_by/2` and `Enum.min_max_by/2` to return a list of results instead of just one.

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minmaxlist test minmaxlist_test.exs
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test/minmaxlist_test.exs 

defmodule MinmaxlistTest do

  use ExUnit.Case

  doctest Minmaxlist



  import Minmaxlist



  test "min list by" do

    result = [1, 2, 3, 4, 5, 6] |> Minmaxlist.min_list_by(&(rem(&1,3)))

    assert result == [3, 6]

    result = [] |> min_list_by(&(rem(&1,3)))

    assert result  == []

  end



  test "max list by" do

    result = [1, 2, 3, 4, 5, 6] |> Minmaxlist.max_list_by(&(rem(&1,3)))

    assert result == [2, 5]

    result = [] |> max_list_by(&(rem(&1,3)))

    assert result  == []

  end



  test "min max list by" do

    result = [1, 2, 3, 4, 5, 6] |> Minmaxlist.min_max_list_by(&(rem(&1,3)))

    assert result == {[3, 6], [2, 5]}

    result = [] |> min_max_list_by(&(rem(&1,3)))

    assert result  == {[], []}

  end



  test "the truth" do

    dataset = [

      %{name: "A", age: 24, income: 4000},

      %{name: "B", age: 22, income: 3300},

      %{name: "C", age: 22, income: 2800},

      %{name: "D", age: 25, income: 5000},

      %{name: "E", age: 22, income: 3300},

      %{name: "F", age: 25, income: 5500},

      %{name: "G", age: 24, income: 4500},

    ]



    result = dataset |> min_list_by(&(&1.age)) |> max_list_by(&(&1.income))

    assert result == [%{name: "B", age: 22, income: 3300}, %{name: "E", age: 22, income: 3300}]



    result = dataset |> min_max_list_by(&(&1.age))

    assert result == {

      [%{name: "B", age: 22, income: 3300}, %{name: "C", age: 22, income: 2800}, %{name: "E", age: 22, income: 3300}],

      [%{name: "D", age: 25, income: 5000}, %{name: "F", age: 25, income: 5500}]

    }

  end

end