Issue #6203 has been reported by ferrous26 (Mark Rada).

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Bug #6203: Array#values_at does not handle ranges with end index past the end of the array
https://bugs.ruby-lang.org/issues/6203

Author: ferrous26 (Mark Rada)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 1.9.3
ruby -v: ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-darwin11.3.0]


When I use Array#values_at I expect that it would be the same as successive calls to Array#[].

There is one case where this does not hold:

    a = [0,1,2,3,4,5]
    a[4..6] # => [4, 5]
    a.values_at(4..6) # => [4,5,nil]

I think this is an inconsistency in the design of Array#values_at. We can look at a more extreme case:

    a[4..100] # => [4, 5]
    a.values_at 4..100 # => [4, 5, nil]

And now it doesn't make any sense.

I think the best solution would be to make Array#values_at be equivalent to successive calls to Array#[]. I have patched rb_range_beg_len() to handle the extra case and opened a pull request on github.


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