Feature #5766: Hash.each_with_object should behave differently when block's arity is 3

• Status: Closed
• Assignee: -
• Target version: -

[rosenfeld (Rodrigo Rosenfeld Rosas)]

Enum.each_with_object is very handy in lots of situations, but specially while dealing with arrays. It would be great to be able to use it with hashes like below:

{a: 1}.each_with_object([]){|k, v, object| ...}

Currently, we need to do

{a: 1}.each_with_object([]) do |pair, object|
k, v = pair
...
end

[matz (Yukihiro Matsumoto)]

Hi,

In message "Re: [ruby-core:41668] [ruby-trunk - Feature #5766][Open] Hash.each_with_object should behave differently when block's arity is 3"
on Thu, 15 Dec 2011 13:07:22 +0900, Rodrigo Rosenfeld Rosas [e-mail] writes:

|Enum.each_with_object is very handy in lots of situations, but specially while dealing with arrays. It would be great to be able to use it with hashes like below:
|
|{a: 1}.each_with_object([]){|k, v, object| ...}

Try

{a: 1}.each_with_object([]){|(k, v), object| ...}

[rosenfeld (Rodrigo Rosenfeld Rosas)]

How do I close this issue?

[rosenfeld (Rodrigo Rosenfeld Rosas)]

Em 15-12-2011 03:14, Yukihiro Matsumoto escreveu:

Hi,

In message "Re: [ruby-core:41668] [ruby-trunk - Feature #5766][Open] Hash.each_with_object should behave differently when block's arity is 3"
on Thu, 15 Dec 2011 13:07:22 +0900, Rodrigo Rosenfeld [e-mail] writes:

|Enum.each_with_object is very handy in lots of situations, but specially while dealing with arrays. It would be great to be able to use it with hashes like below:
|
|{a: 1}.each_with_object([]){|k, v, object| ...}

Try

{a: 1}.each_with_object([]){|(k, v), object| ...}

Great, thanks Matz! I didn't know that. I had tried {|[k, v], object|}
before but haven't think about the parenthesis :)

[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Closed