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lib/witchcraft/monad/protocol.ex
defprotocol Witchcraft.Monad.Protocol do
@moduledoc "The bases for `Witchcraft.Monad`"
@doc ~S"""
`join` takes a recursively nested data structure, and joins the two outermost
levels together to result in one level. This may be seen as a "flattening"
operation for most datatypes.
## Examples
iex> join [[[1,2,3]]]
[[1,2,3]]
"""
@spec join(any) :: any
def join(deep)
end
defimpl Witchcraft.Monad.Protocol, for: List do
def join(list), do: Enum.reduce(list, [], fn(item, acc) -> acc ++ item end)
end