Proposal: new syntax for pattern matching of maps

[Mário Guimarães]

Hi,

what if Elixir supported this new syntax for pattern matching of maps, in which for example,

%{key1, key2}

would be the same as

%{key1: key1, key2: key2}

Also, the following

%{key1, ^key2}

would be the same as

%{key1: key1, key2: ^key2}

What do you think?

I find myself repeating this pattern many times, and I believe this can make the code more succinct and clear.

Obviously this would only work when key1 and key2 are variable names, not expressions.

Probably this has been proposed before, ... but I do not know.

What do you think?

Thanks

[José Valim]

Hi Mario,

This has been proposed a couple times in the past and there are some libraries today that provide a similar syntax. You can search the google groups via the web interface to find previous discussions and the rationale for not including it in the language. There were probably discussions in the forum too.

--

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

[Mário Guimarães]

Hi José,

sorry for duplicating this again.

I have just read your opinion here and it makes sense.

Thanks

Mário