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Optimize empty string compares #16435

Merged
merged 2 commits into from
Dec 14, 2023
Merged

Optimize empty string compares #16435

merged 2 commits into from
Dec 14, 2023

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dawedawe
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Description

According to CA1820 it's more performant to do checks of empty strings by using String.IsNullOrEmpty() or the Length property.

Checklist

  • Test cases added

  • Performance benchmarks added in case of performance changes

  • Release notes entry updated:

    Please make sure to add an entry with short succint description of the change as well as link to this pull request to the respective release notes file, if applicable.

    Release notes files:

    • If anything under src/Compiler has been changed, please make sure to make an entry in docs/release-notes/FSharp.Compiler.Service/<version>.md, where <version> is usually "highest" one, e.g. 42.8.200
    • If language feature was added (i.e. LanguageFeatures.fsi was changed), please add it to docs/releae-notes/Language/preview.md
    • If a change to FSharp.Core was made, please make sure to edit docs/release-notes/FSharp.Core/<version>.md where version is "highest" one, e.g. 8.0.200.

    Examples of release notes entries:

    If you believe that release notes are not necessary for this PR, please add NO_RELEASE_NOTES label to the pull request.

@dawedawe dawedawe requested a review from a team as a code owner December 14, 2023 08:44
@nojaf nojaf added the NO_RELEASE_NOTES Label for pull requests which signals, that user opted-out of providing release notes label Dec 14, 2023
psfinaki
psfinaki approved these changes Dec 14, 2023
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Thanks!

@psfinaki psfinaki enabled auto-merge (squash) December 14, 2023 15:00
@vzarytovskii vzarytovskii merged commit b846403 into dotnet:main Dec 14, 2023
26 checks passed
@dawedawe dawedawe deleted the optimize_empty_string_compares branch December 14, 2023 16:06
OwnageIsMagic added a commit to OwnageIsMagic/fsharp that referenced this pull request Dec 21, 2023
@OwnageIsMagic
Merge remote-tracking branch 'upstream/main'
9246ac8 
* upstream/main: (166 commits)
  typo in foldBack summary (dotnet#16453)
  Fix for dotnet#83 (improve constraint error message) (dotnet#16304)
  Name resolution: resolve interfaces in expressions (dotnet#15660)
  AddExplicitReturnType refactoring (dotnet#16077)
  Disabling 2 tests: running for too long, causing CI timeouts
  Improve value restriction error message dotnet#1103 (dotnet#15877)
  Parens: Keep parens for non-identical infix operator pairs with same precedence (dotnet#16372)
  More release note entries (dotnet#16438)
  Using Ordinal is both faster and more correct as our intent is to do … (dotnet#16439)
  merge (dotnet#16427)
  Optimize empty string compares (dotnet#16435)
  Checker: recover on unresolved type in 'inherit' member (dotnet#16429)
  Release notes proposal (dotnet#16377)
  [main] Update dependencies from dotnet/source-build-reference-packages (dotnet#16411)
  Allow usage of [<TailCall>] with older FSharp.Core package versions (dotnet#16373)
  Parser: recover on unfinished 'as' patterns (dotnet#16404)
  Parens: Keep parens in method calls in dot-lambdas (dotnet#16395)
  Checker: check unfinished obj expression inside computations (dotnet#16413)
  Added default dotnet-tools + additional tasks to launch them (dotnet#16409)
  make `remarks` and `returns` visible in quick info (dotnet#16417)
  ...
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@dawedawe @psfinaki @vzarytovskii @nojaf