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[Fix #500] Mark Performance/MapCompact cop as unsafe #501

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Merged
merged 1 commit into from
May 23, 2025

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jbpextra
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@jbpextra jbpextra commented May 17, 2025

Performance/MapCompact is marked as safe but it should not be as the suggested refactoring is not equivalent

[true, false, nil].compact              #=> [true, false]
[true, false, nil].filter_map(&:itself) #=> [true]

This is confusing for new Ruby developers.


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  • The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
  • Wrote good commit messages.
  • Commit message starts with [Fix #issue-number] (if the related issue exists).
  • Feature branch is up-to-date with master (if not - rebase it).
  • Squashed related commits together.
  • Added tests.
  • Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
  • Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

@@ -1269,7 +1269,7 @@ This cop identifies places where `map { ... }.compact` can be replaced by `filte
[#safety-performancemapcompact]
=== Safety

This cop's autocorrection is unsafe because `map { ... }.compact` might yield
This cop is unsafe because `map { ... }.compact` might yield
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This docs/modules/ROOT/pages/cops_performance.adoc is auto-generated. Can you update the source code document instead? Also, no update to docs/modules/ROOT/pages/cops_performance.adoc is needed.

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Hi @koic, thanks for the review. I have updated the PR as requested. Cheers.

@koic koic merged commit d8cddb4 into rubocop:master May 23, 2025
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koic commented May 23, 2025

Thanks!

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2 participants