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lib/swiss/map.ex
defmodule Swiss.Map do
@moduledoc """
A few extra functions to deal with Maps.
"""
@doc """
Wrapper around `Map.from_struct/1` that tolerates `nil`.
## Examples
iex> Swiss.Map.from_struct(nil)
nil
iex> Swiss.Map.from_struct(%{__struct__: SomeStruct, life: 42})
%{life: 42}
"""
@spec from_struct(struct | nil) :: Map.t | nil
def from_struct(nil), do: nil
def from_struct(struct), do: Map.from_struct(struct)
@doc """
Converts an atom-keyed map into a string-keyed map.
## Examples
iex> Swiss.Map.to_string_keys(%{life: 42})
%{"life" => 42}
iex> Swiss.Map.to_string_keys(%{"life" => 42, death: 27})
%{"life" => 42, "death" => 27}
"""
@spec to_string_keys(Map.t) :: Map.t
def to_string_keys(map) do
map
|> Map.to_list()
|> Stream.map(fn
{key, value} when is_atom(key) -> {Atom.to_string(key), value}
entry -> entry
end)
|> Enum.into(%{})
end
end