It’s not implemented with maps:map/2, but Map.new/2 should do the trick.
`Map.new(map, fn {k, v} -> {k, v * 2} end)`
That said, `maps:map/2` is available:
`:maps.map(fn _k, v -> v * 2 end, %{x: 1, y: 2, z: 3})`
It might be worth exploring whether `Map.map` would be useful/efficient
enough to add for piping purposes.
-a
On Tue, Jan 12, 2021 at 4:51 PM [email protected] <[email protected]>
wrote:
> A common task is to iterate over a map performing some operation thereby
> producing a new map. There are some ways to do this in Elixir presently,
> the simplest probably being for...into:
>
> for {key, val} <- map, into: %{} do
> {key, val * 2}
> end
>
> Enum.reduce/3 is also an option. However, Erlang provides a simple
> function to replace the values of a map with maps:map function:
>
> maps:map(fun(Key, Val) -> 2 * Val end, Map)
>
> I think an equivalent of this in Elixir would be very useful either as
> Map.map/2 or Map.transform_values/2 like so:
>
> Map.transform_values(map, fn {_key, val} -> val * 2 end)
>
> I'm interested to hear if the community considers this a worthwhile
> addition!
>
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--
Austin Ziegler • [email protected] • [email protected]
http://www.halostatue.ca/ • http://twitter.com/halostatue
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