typelevel / typelevel/cats

[Perf] `Set.contains(value)` vs `alleyCatsSetTraverse.contains_(value)`

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#4,106 3 comments 0 reactions 0 assignees View on GitHub

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Scala
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Description

  • Set.contains(value)is O(1).
  • alleycats.std.SetInstances.alleyCatsSetTraverse.contains_(value) is in worst case O(n).

Contributor guide

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First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by locating the implementations of Set.contains(value) and alleycats.std.SetInstances.alleyCatsSetTraverse.contains_(value), then compare their complexity and surrounding tests. Clarify the intended performance behavior and record completion with a focused regression test or benchmark showing the expected complexity.

Written by the indexing model from the issue text.

Assessment

Tech stack
scala
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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