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[SR-15322] Inconsistent behavior of contains in StrideTo/StrideThrough #57644

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swift-ci opened this issue Oct 13, 2021 · 0 comments
Open

[SR-15322] Inconsistent behavior of contains in StrideTo/StrideThrough #57644

swift-ci opened this issue Oct 13, 2021 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella

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Previous ID SR-15322
Radar None
Original Reporter Ragozin (JIRA User)
Type Bug
Additional Detail from JIRA
Votes 1
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

md5: f2854433a036457a93fa1ca80d5ff30e

Issue Description:

StrideTo/StrideThrough conform to Sequence protocol and as such implement contains(_: ) and contains(where: ). When the stride is sorted in descending order, these methods return different values, although Sequence itself makes no assumptions about the order of the elements, and neither StrideTo/StrideThrough implementation documents such behavior.

var descStride = stride(from: 4, to: -2, by: -1)

descStride.contains(2) // erroneously returns false

descStride.contains { $0 == 2 } // returns true

descStride.sorted(by: >).contains(2) // returns true

descStride.sorted(by: <).contains(2) // returns true

Compare this to ascending stride behavior:

var ascStride = stride(from: -2, to: 4, by: 1)

ascStride.contains(2) // returns true

ascStride.contains { $0 == 2 } // returns true

ascStride.sorted(by: >).contains(2) // returns true

ascStride.sorted(by: <).contains(2) // returns true
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella
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