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Bug #5406

inconsistent odd-length array rejection in Hash[*ary] vs Hash[ary]

Added by sunaku (Suraj Kurapati) almost 9 years ago. Updated almost 8 years ago.

Status:
Closed
Priority:
Normal
Target version:
ruby -v:
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux]
Backport:
[ruby-core:39945]

Description

Hello,

Hash[*ary] raises an error when given odd number of arguments:

Hash.
ArgumentError: odd number of arguments for Hash
from (irb):3:in []'
from (irb):3
from /usr/bin/irb:12:in
'

In contrast, Hash[ary] silently accepts odd-length arrays:

Hash.
{}
Hash.
{
1 => 2
}
Hash.1, 2], [3" class="external">
{
1 => 2,
3 => nil
}
Hash.1, 2], [3,4,5" class="external">
{
1 => 2
}

I think this behavior is inconsistent. Please either:

(1) change Hash[ary] to raise errors upon seeing odd-length arrays or

(2) change Hash[*ary] to not raise an error for odd number of arguments and instead accept the last odd argument as a key with value nil, just like this existing behavior:

Hash.1, 2], [3" class="external">
{
1 => 2,
3 => nil
}

Thanks for your consideration.


Related issues

Related to Ruby master - Bug #1385: Wonderful undocumented feature in Ruby 1.8.7 & 1.9Closedyugui (Yuki Sonoda)04/17/2009Actions

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