From: "stephencelis (Stephen Celis)" <stephen.celis@...>
Date: 2013-06-10T13:32:00+09:00
Subject: [ruby-core:55396] [ruby-trunk - Bug #8507] Keyword splat does not convert arg to Hash


Issue #8507 has been updated by stephencelis (Stephen Celis).


To return to the original question:

> Do you really want to do splat(**nil)?

I find that Ruby's flexibility has been nice when providing public interfaces in gems and libraries. It's nice to be able to pass in *nil to a public method and have it discard the argument as unnecessary. Likewise, it's nice to be able to accept **nil as the keyword argument to a public interface and have it discard the argument and look to its default keyword arguments instead.
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Bug #8507: Keyword splat does not convert arg to Hash
https://bugs.ruby-lang.org/issues/8507#change-39820

Author: stephencelis (Stephen Celis)
Status: Feedback
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: syntax
Target version: current: 2.1.0
ruby -v: ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin12.3.0]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


A single splat is useful to convert an object to an array as it passes from one method to the next, so I expected the double-splat to do the same and convert the object to a hash.

<pre><code class="ruby">
def splat *args
  p args
end
def double_splat **kwargs
  p args
end
splat(*nil)  # []
splat(**nil) # TypeError: no implicit conversion of nil into Hash
</code></pre>

For the sake of consistency, wouldn't it make sense to wrap the double-splatted arg with Hash() the same way a single-splatted arg is wrapped with Array()?


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