[ruby-core:57352] Re: [ruby-trunk - Feature #4830] Provide Default Variables for Array#each and other iterators

I don't like this. The only thing that doesn't hurt so much would be
something like scala's underscores for one parameter blocks, but I'm not
really sure about those either.

On Tuesday, September 24, 2013, alexeymuranov (Alexey Muranov) wrote:

>
> Issue #4830 has been updated by alexeymuranov (Alexey Muranov).
>
>
> How should nested blocks behave?
>
> [[1, 2], [3, 4]].map { item.map { item + 1 } }
> ----------------------------------------
> Feature #4830: Provide Default Variables for Array#each and other iterators
> https://bugs.ruby-lang.org/issues/4830#change-41955
>
> Author: lazaridis.com (Lazaridis Ilias)
> Status: Assigned
> Priority: Low
> Assignee: matz (Yukihiro Matsumoto)
> Category: core
> Target version: next minor
>
>
> for arrays: use "item" by default
> for hashes: use "key" and "value" by default
>
> names = ["Jane", "Michele", "Isabella"]
> names.each { |name| print name, "\n" }
> names.each { print item, "\n" }
>
> contact = {name:"Jane", phone:"1234567"}
> contact.each { |key, value| print key, ": ", value, "\n"}
> contact.each { print key, ": ", value, "\n"}
>
> -
>
> The benefits are:
>
> * more compact code (without loosing clarity of the code).
> * no repetitions ("names, name, name") in a one-liner with {} block
>
> This extension does not break any existent behaviour.
>
>
> --
> http://bugs.ruby-lang.org/
>


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