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Bug #21449

closed

Set#divide is order dependent and not working correctly

Bug #21449: Set#divide is order dependent and not working correctly
1

Added by tompng (tomoya ishida) 4 months ago. Updated 4 months ago.

Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
ruby 3.5.0dev (2025-06-23T11:03:48Z master af6b98f7a2) +YJIT +MN +PRISM [arm64-darwin22]
Backport:
3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
[ruby-core:122580]

Description

Set[0,1,2,3].divide{(_1 - _2).abs == 1}
#=> #<Set: {#<Set: {0, 1, 2, 3}>}>

Set[0,2,3,1].divide{(_1 - _2).abs == 1}
#=> #<Set: {#<Set: {0, 1, 2, 3}>}> (ruby 3.4)
#=> #<Set: {#<Set: {0, 1}>, #<Set: {2, 3, 1}>}> (ruby 3.5.0dev)

Result of Set#divide wrongly depends on set order.

Set.new(1000.times.to_a.shuffle).divide{(_1 - _2).abs == 1}.size
#=> 1 (ruby 3.4)
#=> 250±20 (ruby 3.5.0dev)
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