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Bug #18953
closed`Array#uniq` doesn't evaluate the given block when the size of the array is one
Status:
Rejected
Assignee:
-
Target version:
-
ruby -v:
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [arm64-darwin21]
Description
Array#uniq
doesn't evaluate the given block when the size of the array is one. Is this expected behavior?
$ ruby -e '[42, 43].uniq { _1.foo }; puts true'
-e:1:in `block in <main>': undefined method `foo' for 42:Integer (NoMethodError)
[42, 43].uniq { _1.foo }; puts true
^^^^
Did you mean? floor
from -e:1:in `uniq'
from -e:1:in `<main>'
$ ruby -e '[42].uniq { _1.foo }; puts true'
true
Updated by mrkn (Kenta Murata) over 2 years ago
I hope this behavior should be expected.
However, sort_by
, max_by
, and min_by
call the given blocks even if the receiver array has only one item.
irb(main):001:0> [42].sort_by { _1.foo }
(irb):1:in `block in <top (required)>': undefined method `foo' for 42:Integer (NoMethodError)
Did you mean? floor
from (irb):1:in `each'
from (irb):1:in `sort_by'
from (irb):1:in `<main>'
from /home/mrkn/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/irb-1.4.1/exe/irb:11:in `<top (required)>'
from /home/mrkn/.rbenv/versions/3.1.0/bin/irb:25:in `load'
from /home/mrkn/.rbenv/versions/3.1.0/bin/irb:25:in `<main>'
irb(main):002:0> [42].max_by { _1.foo }
(irb):2:in `block in <top (required)>': undefined method `foo' for 42:Integer (NoMethodError)
Did you mean? floor
from (irb):2:in `each'
from (irb):2:in `max_by'
from (irb):2:in `<main>'
from /home/mrkn/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/irb-1.4.1/exe/irb:11:in `<top (required)>'
from /home/mrkn/.rbenv/versions/3.1.0/bin/irb:25:in `load'
from /home/mrkn/.rbenv/versions/3.1.0/bin/irb:25:in `<main>'
irb(main):003:0> [42].min_by { _1.foo }
(irb):3:in `block in <top (required)>': undefined method `foo' for 42:Integer (NoMethodError)
Did you mean? floor
from (irb):3:in `each'
from (irb):3:in `min_by'
from (irb):3:in `<main>'
from /home/mrkn/.rbenv/versions/3.1.0/lib/ruby/gems/3.1.0/gems/irb-1.4.1/exe/irb:11:in `<top (required)>'
from /home/mrkn/.rbenv/versions/3.1.0/bin/irb:25:in `load'
from /home/mrkn/.rbenv/versions/3.1.0/bin/irb:25:in `<main>'
Updated by nobu (Nobuyoshi Nakada) over 2 years ago
I think this is an expected behavior, but an implementation detail.
Updated by jeremyevans0 (Jeremy Evans) over 2 years ago
- Status changed from Open to Rejected
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