From: "marcandre (Marc-Andre Lafortune)" <ruby-core@...>
Date: 2013-12-11T03:49:32+09:00
Subject: [ruby-core:59033] [ruby-trunk - Feature #9239] Array#to_h ignores	flat arrays


Issue #9239 has been updated by marcandre (Marc-Andre Lafortune).

Assignee set to matz (Yukihiro Matsumoto)

Moving to "feature", as the current documentation states that elements that are not 2-element arrays are ignored, so it is different from Hash.[]

My opinion is that the fact that `Hash[1,2,3,4] # => {1 => 2, 3 => 4}` is a misfeature and that this usage should not be encouraged.

On the other hand, Array#to_h could raise an error on elements that are not 2-element arrays. I argued otherwise before, but maybe that would be safer.
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Feature #9239: Array#to_h ignores flat arrays
https://bugs.ruby-lang.org/issues/9239#change-43589

Author: sawa (Tsuyoshi Sawada)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: 


=begin
My understanding was that the newly introduced `Array#to_h` was to be equivalent to `Hash.[]`. But when I give a flat array, it returns an empty hash:

    [:a, :b].to_h # => {}
    [:a].to_h     # => {}

I expected `{:a => :b}` for the first example, and `ArgumentError: odd number of arguments for Hash` for the second example, as is with `Hash[]`. Was it intended to be different? If so, why is that the case? Even if it is to be different, it should at least raise an error when a flat array is given.
=end



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