focus

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A functional optics library. Create and compose lenses to view, set, and modify data inside arbitrarily nested maps, lists, and tuples.

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focus lib types.ex

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lib/types.ex

defmodule Focus.Types do
  @moduledoc """
  Shared elements for the Focus modules.
  """
  @type product :: map | struct | tuple
  @type sum :: list
  @type traversable :: product | sum
  @type maybe :: {:ok, any} | {:error, any}
  @type optic :: Lens.t()
end

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