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Elixir small utilities

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smallex lib lst.ex
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lib/lst.ex 

defmodule Lst do

	@moduledoc """

	List library.

	"""



	@doc """

	Pad number at zero (string return)



	## Examples

		iex> Lst.to_csv( [ 1, "ab", 8, true ] )

		"1, ab, 8, true"

	"""

	def to_csv( list ), do: list |> Enum.reduce( "", fn( x, acc ) -> "#{acc}, #{x}" end ) |> String.slice( 2..-1 )



	@doc """

	Calculate frequency of values ftom list



	## Examples

		iex> Lst.frequency( [ "abc", "abc", "xyz", "abc", "def", "xyz" ] )

		%{ "abc" => 3, "def" => 1, "xyz" => 2 }

		iex> Lst.frequency( [ %{ "a" => "abc" }, %{ "a" => "abc" }, %{ "a" => "xyz" }, %{ "a" => "abc" }, %{ "a" => "def" }, %{ "a" => "xyz" } ] )

		%{ %{ "a" => "abc"} => 3, %{ "a" => "def" } => 1, %{ "a" => "xyz" } => 2 }

	"""

	def frequency( list ), do: list |> Enum.reduce( %{}, fn( key, value ) -> Map.update( value, key, 1, &( &1 + 1 ) ) end )

end