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Convert numbers to various string formats, such as currency

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number lib number macros.ex
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lib/number/macros.ex 

defmodule Number.Macros do

  @moduledoc false



  @doc """

  Determines whether a given value is blank or not. A value is considered blank

  if it is `" "`, `""`, or `nil`.



  ## Example



      iex> Number.Macros.is_blank(" ")

      true



      iex> Number.Macros.is_blank("")

      true



      iex> Number.Macros.is_blank(nil)

      true



      iex> Number.Macros.is_blank("hello world")

      false



      iex> Number.Macros.is_blank(123)

      false



  This macro can also be used in guards:



      def foo(bar) when is_blank(bar), do: # ...

  """

  defmacro is_blank(value) do

    quote do

      unquote(value) in [" ", "", nil]

    end

  end

end