[PROPOSAL] Map deconstruction syntax

[Joshua Nussbaum]

Hi,

What do you think about adding map deconstruction syntax similar to JavaScript. It would remove the need to declare the key and binding variable when they are identical names.

Often the map keys and binding var use the same name:

# without deconstruction

%{name: name, email: email} = user

vs

# with deconstruction (identical)

%{name, email} = user

This would work too for function definitions `def send_email(%{name, email}) do ...`, pattern matching ` case user, do: %{name, email} -> ....` as well as updates `%{user | email, name}`.

It would also require updating `mix format` to replace `%{key: key}` with `%{key}`

Here is a prototype of the changes required to the compiler:

https://github.com/elixir-lang/elixir/compare/master...joshnuss:map-destructure

Best,

Josh

 

[Fernando Tapia Rico]

Hi Joshua,

This has been suggested a few times in the mailing list: https://groups.google.com/forum/#!searchin/elixir-lang-core/short_maps%7Csort:date

Hope that helps :)

[Joshua Nussbaum]

Thanks Fernando,

I should have searched first :)