From: "rosenfeld (Rodrigo Rosenfeld Rosas)" <rr.rosas@...>
Date: 2012-07-01T22:21:44+09:00
Subject: [ruby-core:46054] [ruby-trunk - Feature #6414] Destructuring Assignment


Issue #6414 has been updated by rosenfeld (Rodrigo Rosenfeld Rosas).


-1. I'd still like to see Ruby supporting CoffeeScript hash style for this common pattern:

Instead of
a = 1; b = 2; c = {a: a, b: b}

I'd prefer to write just c = {a, b}. The current proposed syntax wouldn't allow such a feature in the future.... :(

By the way, I can't remember what is the current situation of an old proposition to allow things like {"#{interpolation}": value} as well as {'some string': value}.

Was it already accepted? Is there already a slide for it?
----------------------------------------
Feature #6414: Destructuring Assignment 
https://bugs.ruby-lang.org/issues/6414#change-27661

Author: edtsech (Edward Tsech)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 2.0.0


I mean:

john = {name: "John", last: "Smith"}
{name, last} = john # extract value by key from the hash and set to local variable with same name
name # => "John"
last # -> "Smith"

Useful for ex. for  "options" hashes:
def select(options={})
  {only, except} = options
  ...
end

As extra part of this feature can be hash constructing in this way:

name = "John"
last    = "Smith"
find({name, last}) # equals to => find({name: "John", last: "Smith"})

I think both really nice to have in Ruby.
Thanks.


-- 
http://bugs.ruby-lang.org/