Hi,
This has been proposed before. Someone came up
with https://github.com/meyercm/shorter_maps which accomplishes this as a
macro. It might be worth a discussion again at this point but it is worth
noting that this is a proposal that has been on this list before, and so it
would likely be good to address considerations raised there in this new
proposal.
- Ben
On Monday, June 26, 2023 at 3:36:16 PM UTC-4 torres....@gmail.com wrote:
> Hi,
> I'd like to propose a syntax sugar for maps, specially for pattern
> matching and construction.
>
> # Map construction
> language = :elixir
> %{ language }
> => %{language: :elixir}
>
>
> # Map pattern match
> map = %{feature: :pattern_match}
> %{ feature } = map
> => %{feature: :pattern_match}
> feature
> => :pattern_match
>
> case %{ key: "some value" } do
> %{key} ->
> key
> _ ->
> nil
> end
> => "some value"
>
>
> # Map in function args
> defmodule Foo do
> def bar(%{ key }),
> do: key
> end
>
> Foo.bar(%{ key: "some value" })
> => "some value"
>
>
> Of course this would be just a syntax sugar. It won't compromise program's
> performance.
>
> The advantage of that is mainly when pattern matching function, but also
> *case* and *with* statements, on maps with some considerable amount of
> keys.
>
>
> with %{ key1 } <- %{key1: "value1"},
> {:ok, %{key2, key3, key4, key5}} <-
> {:ok, %{key2: "value2", key3: "value3", key4: "value4", key5: "value5"}}
> do
> {key1, key2, key3, key4, key5}
> end
> => {"value1", "value2", "value3", "value4", "value5"}
>
>
> I'd like to know if more people would be interested on that too.
>
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