Feature Request: Destructuring Maps

[Sheharyar Naseer]

Most Elixir devs will agree with me, that when pattern matching on Maps, the variable names are usually the same as the keys:

def some_method(%{user: %{id: id, email: email}, action: action, message: message}) do
  # do something
end


I propose another way to pattern match Key-Value pairs in Maps, using the variable names alone (Similar to how you destructure objects in ES6):

%{ a, b } = %{a: 1, b: 2}

and

def some_method(%{user: %{ id, email }, action, message}) do
  # do something
end

If this makes sense to others, I'm can try doing this and send a PR (if someone can point me in the right direction 😊).

[FTS]

FYI: https://github.com/whatyouhide/short_maps

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[José Valim]

This discussion comes up from time to time, so I would recommend seeing the previous discussions. There are many in favor of this feature and many that do not appreciate the loss in readability.

Although I have almost no reservations against using a shorthand syntax for matching, I find it too cryptic for creates:

%{name, age} #=> %{name: name, age: age}

And even more for updates:

%{user | name, age} #=> %{user | name: name, age: age}

The choice is in supporting the syntax only for matching but that makes the feature somewhat inconsistent.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/CAHsFyS8as8QDZd8T1wk-_CrGBnzDteNgfNAidG4JS7q_z8%2BLNg%40mail.gmail.com.

[Sheharyar Naseer]

Personally I like the "create" and "update" shorthand syntaxes, but I guess that goes against the goal of writing explicit elixir code. As for those against it, I find their argument weak since every developer/team is open to following their own style guides without anyone forcing them to do otherwise but I do get where they are coming from.

FYI: https://github.com/whatyouhide/short_maps

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