Releases · typelevel/cats

@jozic

Cats v2.12.0 is a binary-compatible release in the 2.x series. It is published for Scala 2.12, 2.13, and 3.3+ with Scala.js 1.13+ and Scala Native 0.5.

What's Changed

Features

Add flatMapOrKeep to Monad by @jozic in #4602

Behind-the-Scenes

Remove special ExecutionContextExecutor by @kapunga in #4601
Bump base version to 2.12 by @mpilquist in #4606

Updates

Update nscplugin, sbt-scala-native to 0.5.1 by @typelevel-steward in #4585
Update discipline-munit to 2.0.0 by @typelevel-steward in #4605

New Contributors

@kapunga made their first contribution in #4601

Full Changelog: v2.11.0...v2.12.0

@m50d

Cats v2.11.0 is a binary-compatible release in the 2.x series. It is published for Scala 2.12, 2.13, and 3.3+ with Scala.js 1.13+ and Scala Native 0.4.

What's Changed

Features

Add OptionT#unlessM by @m50d in #4519
Add mapOrKeep to Functor by @jozic in #4582
Expose FunctionK.liftFunction as a part of the Scala 3 API by @pomadchin in #4600
FunctionKLift cross compiled liftFunction suite by @pomadchin in #4603

Optimizations

Replaces other Applicative.pure(()) with .unit by @satorg in #4558
Use Applicative#unit in Foldable#traverse_ by @valencik in #4557
Optimize traverse by @TimWSpence in #4498

Fixes

Fix EitherT Bifunctor priority, add Bifoldable instance by @joroKr21 in #4576
fix ambiguous ContravariantShow[SortedSet[A]] (& SortedMap) by @chwthewke in #4575
Reduce visibility of value member in the NonEmptyMap syntax by @TonioGela in #4559

Documentation

Fix link to Fetch by @mainali123 in #4522
update book's link to second edition by @naferx in #4524
fix wording at end of Semigroup doc by @vreuter in #4551
Fix choice alias render in docs by @Masynchin in #4580
fix typo by @Ghurtchu in #4583
Use syntax in Functor's doc examples by @jozic in #4599

Behind-the-scenes

fix MonadOps.scala and FunctionKMacros.scala dir by @xuwei-k in #4548
Bump base version to 2.11 by @armanbilge in #4496
add explicit type by @xuwei-k in #4508
fix warning in build.sbt by @xuwei-k in #4518
enforce new wildcard syntax by @xuwei-k in #4544
Update copyright date by @geny200 in #4593

Updates

Update sbt-typelevel, sbt-typelevel-site to 0.5.0 by @typelevel-steward in #4497
Update sbt to 1.9.4 by @typelevel-steward in #4500
Update scalafmt-core to 3.7.13 by @typelevel-steward in #4502
Update scalafmt-core to 3.7.14 by @typelevel-steward in #4503
Update sbt-jmh to 0.4.6 by @typelevel-steward in #4506
Update scala3-library, ... to 3.3.1 by @typelevel-steward in #4507
Update nscplugin, sbt-scala-native, ... to 0.4.15 by @typelevel-steward in #4505
Update sbt-typelevel, sbt-typelevel-site to 0.5.1 by @typelevel-steward in #4509
Update scala-library, scala-reflect to 2.13.12 by @typelevel-steward in #4510
Update sbt-typelevel, sbt-typelevel-site to 0.5.2 by @typelevel-steward in #4511
Update sbt to 1.9.5 by @typelevel-steward in #4512
Update munit to 1.0.0-M9 by @typelevel-steward in #4513
Update sbt to 1.9.6 by @typelevel-steward in #4515
Update sbt-typelevel, sbt-typelevel-site to 0.5.3 by @typelevel-steward in #4517
Update munit to 1.0.0-M10 by @typelevel-steward in #4516
Update sbt-scalajs, scalajs-compiler, ... to 1.14.0 by @typelevel-steward in #4520
Update sbt-typelevel, sbt-typelevel-site to 0.5.4 by @typelevel-steward in #4523
Update flatMapF in nomenclature.md by @pera in #4525
Update nscplugin, sbt-scala-native, ... to 0.4.16 by @typelevel-steward in #4526
Update sbt-typelevel, sbt-typelevel-site to 0.6.0 by @typelevel-steward in #4527
Update sbt to 1.9.7 by @typelevel-steward in #4529
Update scalafmt-core to 3.7.15 by @typelevel-steward in #4530
Update sbt-typelevel, sbt-typelevel-site to 0.6.1 by @typelevel-steward in #4532
Update sbt-typelevel, sbt-typelevel-site to 0.6.2 by @typelevel-steward in #4535
Update scalafmt-core to 3.7.17 by @typelevel-steward in #4536
Update sbt-typelevel, sbt-typelevel-site to 0.6.3 by @typelevel-steward in #4538
Update sbt-jmh to 0.4.7 by @typelevel-steward in #4539
Update sbt to 1.9.8 by @typelevel-steward in #4541
Update sbt-typelevel, sbt-typelevel-site to 0.6.4 by @typelevel-steward in #4542
Update sbt-typelevel, sbt-typelevel-site to 0.6.5 by @typelevel-steward in #4546
Update nscplugin, sbt-scala-native, ... to 0.4.17 by @typelevel-steward in #4550
Update sbt-scalajs, scalajs-compiler, ... to 1.15.0 by @typelevel-steward in #4549
Update munit to 1.0.0-M11 by @typelevel-steward in #4556
Update sbt-typelevel, sbt-typelevel-site to 0.6.6 by @typelevel-steward in #4560
Update scalafmt-core to 3.8.0 by @typelevel-steward in #4563
Update sbt to 1.9.9 by @typelevel-steward in #4565
Update sbt-typelevel, sbt-typelevel-site to 0.6.7 by @typelevel-steward in #4566
Update scala-library, scala-reflect to 2.13.13 by @typelevel-steward in #4568
Update scala-library, scala-reflect to 2.12.19 by @typelevel-steward in #4567
Update scala3-library, ... to 3.3.3 by @typelevel-steward in #4571
Update sbt-buildinfo to 0.12.0 by @typelevel-steward in #4577
Update scalafmt-core to 3.8.1 by @typelevel-steward in #4578
Update sbt-scalajs, scalajs-compiler, ... to 1.16.0 by @typelevel-steward in #4581
Update discipline-core to 1.6.0 by @typelevel-steward in #4588
Update scalacheck to 1.17.1 by @typelevel-steward in #4586
Update sbt-typelevel, sbt-typelevel-site to 0.7.0 by @typelevel-steward in #4591
Update munit to 1.0.0-RC1 by @typelevel-steward in #4592
Update scala-library, scala-reflect to 2.13.14 by @typelevel-steward in #4594
Update sbt to 1.10.0 by @typelevel-steward in #4596
Update sbt-typelevel, sbt-typelevel-site to 0.7.1 by @typelevel-steward in #4597
Update munit to 1.0.0 by @typelevel-steward in #4604

New Contributors

@m50d made their first contribution in #4519
@mainali123 made their first contribution in #4522
@naferx made their first contribution in #4524
@vreuter made their first contribution in #4551
@chwthewke made their first contribution in #4575
@Ghurtchu made their first contribution in #4583
@geny200 made their first contribution in #4593
@pomadchin made their first contribution in #4600

Full Changelog: v2.10.0...v2.11.0

@ivan-klass

Cats v2.10.0 is a binary-compatible release in the 2.x series. It is published for Scala 2.12, 2.13, and 3.3+ with Scala.js 1.13+ and Scala Native 0.4.

This release includes #4477 which fixes the encoding of Apply (and Semigroupal) syntax to avoid allocating an intermediate "Ops" wrapper class. This affected commonly-used operators such as *>. Unfortunately libraries will need to re-compile and re-publish against Cats v2.10.0 to use the new allocation-free syntax.

Thanks to all the contributors to this release! There are many accumulated changes.

What's Changed

Features

Add OptionT combinators for effectful Boolean by @ivan-klass in #4390
Add Bifunctor#leftLiftTo by @eugkhp in #4336
Add Kleisli.localK FunctionK helper by @ivan-klass in #4406
add zip for NonEmptySeq by @CristinaHG in #4431
Add Functor#composeBifunctor by @bpholt, @armanbilge in #4434
Add Validated.unit by @VladKopanev in #4420
Add raiseWhen/raiseUnless convenience methods to EitherObjectOps by @Daenyth in #4436
OneAnd: add PartialOrder and Order instances by @satorg in #4460
Add Defer instances for Eq, Hash, Order, Show, and variants by @morgen-peschke in #4414
Fix ambiguous Const instances and add missing instances by @joroKr21 in #4458

Optimizations

Avoid allocating an Option in NonEmptyList#last by @valencik in #4417
Improve foldRight for Seq instance by @rudolmi in #4440

Fixes

Move catsTraverseForSeq to lower-priority implicit scope by @UlisesTorrella in #4373
Making Map.unorderedTraverse stack safe by @TonioGela in #4463
Fix unnecessary syntax allocation by @mox692 in #4477

Documentation

Nomenclature for the SemigroupK hierarchy by @TimWSpence in #4329
Fix readme by @danicheg in #4368
Fix the nested unordered list HTML view of docs/typeclasses/alternative.md by @ShapelessCat in #4371
Fix typo by @Masynchin in #4381
Add missing syntax highlightning by @Masynchin in #4382
Add a link about fs2-throttler by @kovstas in #4359
Publish alleycats docs on website by @armanbilge in #4393
cats.implicits._ -> cats.syntax.all._ by @armanbilge in #4394
Update no script links in readme by @RawToast in #4397
Update CONTRIBUTING.md microsite information by @fabianhjr in #4399
Improve Chain Documentation by @reardonj in #4386
Add API documentation links by @reardonj in #4401
f >>> g in symbols table by @jose-puente in #4411
Fix outdated edit link in algebra docs by @lenguyenthanh in #4418
Update version in readme by @lenguyenthanh in #4422
Fix typo in Ior docs by @fighur in #4423
Update Ring-like table in Algebra for Semifield added in #3979 by @benhutchison in #4426
Add foldr note to Foldable doc by @lenguyenthanh in #4425
Bump versions in law testing doc by @lenguyenthanh in #4424
ExhaustiveCheck is a list, not a stream by @rossabaker in #4442
Fix traverseWithIndex => traverseWithIndexM by @lenguyenthanh in #4443
Fix typo in core's package object docs by @fatalem0 in #4446
Fix jump_start_guide.md typo by @BokChoyWarrior in #4465
Remove Either documentation page by @reardonj in #4400
Add doctest for IdT by @bulatkhabib in #4445
Fix typo by @bwignall in #4482

Adopters

Add IPONWEB as an adopter by @bio-aeon in #4384
Update ADOPTERS.md by @ehsun7b in #4435
Add PITS Globale Datenrettungsdienste as an adopter by @arnoldberlin in #4472

Behind-the-scenes

Bump base version to 2.10 by @armanbilge in #4341
Remove plugins we get via sbt-typelevel by @armanbilge in #4344
Clean up benchmarks' dependencies by @danicheg in #4355
Fix Native CI by @armanbilge in #4363
remove unused version number by @kailuowang in #4358
Move NonEmptyReducible into its own file by @fabianhjr in #4398
Delete PR template by @joroKr21 in #4459
Replaced traverse benchmarks with something more representative by @djspiewak in #4403
Update to sbt-typelevel 0.5.0 by @armanbilge in #4478

Updates

Update scala3-library, ... to 3.3.0 by @typelevel-steward in #4448
Update nscplugin, sbt-scala-native, ... to 0.4.14 by @typelevel-steward in #4454
Update scala-library, scala-reflect to 2.12.18 by @typelevel-steward in #4455
Update scala-library, scala-reflect to 2.13.11 by @typelevel-steward in #4456
Update sbt-scalajs, scalajs-compiler, ... to 1.13.2 by @typelevel-steward in #4464

New Contributors

@ShapelessCat made their first contribution in #4371
@UlisesTorrella made their first contribution in #4373
@Masynchin made their first contribution in #4381
@bio-aeon made their first contribution in #4384
@kovstas made their first contribution in #4359
@fabianhjr made their first contribution in #4398
@reardonj made their first contribution in #4386
@eugkhp made their first contribution in #4336
@jose-puente made their first contribution in #4411
@lenguyenthanh made their first contribution in #4418
@fighur made their first contribution in #4423
@ehsun7b made their first contribution in #4435
@CristinaHG made their first contribution in #4431
@VladKopanev made their first contribution in #4420
@rudolmi made their first contribution in #4440
@fatalem0 made their first contribution in #4446
@BokChoyWarrior made their first contribution in #4465
@arnoldberlin made their first contribution in #4472
@bulatkhabib made their first contribution in #4445
@mox692 made their first contribution in #4477

Full Changelog: v2.9.0...v2.10.0

@nikololiahim

Cats v2.9.0 is a binary-compatible release in the 2.x series. It is published for Scala 2.12, 2.13, and 3.2+ with Scala.js 1.8+ and Scala Native 0.4.

What's Changed

Features

Added updated to Traverse by @nikololiahim in #4248
Added zipWithLongIndex, mapWithLongIndex and traverseWithLongIndexM by @nikololiahim in #4247
Add collectFirst to the NonEmptyCollection interface by @DavidGregory084 in #4275
Added discipline tests for the new Traverse laws by @nikololiahim in #4283
Add traverseCollect to TraverseFilter typeclass by @emilhotkowski in #4277
Add NonEmptyList#prependAll by @saeltz in #4267
Add EitherT#biSemiflatTap which combines leftSemiflatTap and semiflatTap by @exp0nge in #4293
Optimize Alternative (part 3): add prependK/appendK specializations for Cats NE wrappers by @satorg in #4055
Added parFlatMapN by @TonioGela in #4243
Added Align instances for Id and Kleisli by @atnoya in #4287
Add ApplicativeError#voidError by @armanbilge in #4324

Optimizations

Change the ordering of invocations in Defer#fix by @TimWSpence in #4252
Optimise boilerplate generators, use instance constructors by @joroKr21 in #3871
Avoid using NonFatal.unapply by @jhnsmth in #4282
Use SAM syntax for typeclass instances where possible by @joroKr21 in #4279
Singleton monoid instances by @TimWSpence in #4314
Avoid allocations for Monoid instances where possible by @bplommer in #4309
Make string building a bit more efficient for NonEmptySeq by @danicheg in #4326

Fixes

Don't require Order for the value on Cogen for SortedMap and NonEmptyMap by @cquiroz in #4296
Make cats.compat a package object for for2_13Use3 compatibility by @TonioGela in #4315
Fix ambiguous contains_ syntax by @armanbilge in #4320

Deprecations

Deprecate HashLaws#sameAsUniversalHash by @armanbilge in #4319

Documentation

Remove LEGO from adopters list by @hejfelix in #4242
Fix Free Monad example by @youta32449999 in #4253
Mention asRight and asLeft for constructing Either values by @benhutchison in #4257
Fix comment in Free Monad example by @youta32449999 in #4259
Add proof of inconsistency for a Validated Monad by @TonioGela in #4255
Mention tupled syntax, a Cats workhorse that deserves to be more well known by @benhutchison in #4269
Add missing scala modifier to code block by @armanbilge in #4274
Build docs on 2.13 by @armanbilge in #4238
Fix list formatting in docs / site by @valencik in #4290
Move the adopters' companies list to a separate file/page by @danicheg in #4291
Keep the cats version up to date on the website by @danicheg in #4294
Include laws in published API docs by @armanbilge in #4318
Fix markdown syntax for link to Applicative in OptionT by @yoshinorin in #4321
Add more DocTests for OptionT by @timo-schmid in #4311

Behind-the-scenes

Ignore updates to cats-core by @armanbilge in #4241
Bump base version to 2.9 by @armanbilge in #4239
Refactored Chain and CollectiveMonoid benchmarks by @TonioGela in #4264
Fix obvious and straightforward warnings by @satorg in #4323
Add commits to .git-blame-ignore-revs by @armanbilge in #4334
Add stack-safety test for ContT#map by @eigenvariable in #4335
Add release notes config by @armanbilge in #4330

Updates

Update sbt-scalajs, scalajs-compiler, ... to 1.10.1 by @typelevel-steward in #4254
Update nscplugin, sbt-scala-native, ... to 0.4.7 by @typelevel-steward in #4289
Update scalacheck to 1.17.0 by @typelevel-steward in #4297
Update scala3-library, ... to 3.2.1 by @typelevel-steward in #4337

New Contributors

@hejfelix made their first contribution in #4242
@youta32449999 made their first contribution in #4253
@nikololiahim made their first contribution in #4248
@TonioGela made their first contribution in #4255
@emilhotkowski made their first contribution in #4277
@valencik made their first contribution in #4290
@exp0nge made their first contribution in #4293
@cquiroz made their first contribution in #4296
@atnoya made their first contribution in #4287
@yoshinorin made their first contribution in #4321
@eigenvariable made their first contribution in #4335
@timo-schmid made their first contribution in #4311

Full Changelog: v2.8.0...v2.9.0

@isomarcte

Cats v2.8.0 is a binary-compatible release in the 2.x series. It is published for Scala 2.12, 2.13, and 3.1+ with Scala.js 1.8+ and Scala Native 0.4. This release is the first to support Scala 3 on the Native platform.

Features

Add foldF to IorT by @isomarcte in #4075
Add toIorT on EitherT by @isomarcte in #4108
Add Order and PartialOrder For SortedMap by @isomarcte in #4092
SemigroupK/MonoidK methods by @TimWSpence in #4084
added ifF to Functor by @atais in #4146
Alleycats: upgrade Iterable instance from Foldable to Traverse, add TraverseFilter by @bplommer in #4152
Add Chain#knownSize and Chain#lengthCompare (sizeCompare) methods by @satorg in #4159
Add missing Chain#distinctBy method by @satorg in #4156
Move contain_ to UnorderedFoldable by @BalmungSan in #4183
Added flatMapN by @domaspoliakas in #4009
Add getOrRaise for OptionT, EitherT and IorT by @geirolz in #4212
Support lifting polymorphic functions to FunctionK in Scala 3 by @bplommer in #3895
Add mapAccumulate to Traverse by @BalmungSan in #4209
Add replicateA_, parReplicateA_ by @rabinarai1 in #4208
Cross-build for Scala 3 + Native by @armanbilge in #4228

Optimizations

More efficient slidingN functions by @joroKr21 in #4067
Optimize Chain length methods by @bplommer in #4166
A few more Chain optimizations by @johnynek in #4170
Optimise Kleisli with specialized Function1 implementation by @bplommer in #4211
override more mapAccumulate methods in Traverse by @johnynek in #4214
Optimize replicateA to have same recursive structure as replicateA_ by @johnynek in #4233
Tail-recursive replicateA by @armanbilge in #4234

Fixes

Add Semigroupal[Id] to implicit scope by @joroKr21 in #4056
Remove @implicitNotFound annotations by @armanbilge in #4060
Return stack-safe Function0 and Function1 from Semigroup#combine by @mrdziuban in #4093
remove unused Apply#tupleN type param by @xuwei-k in #4142
Make catsInstancesForIdCompat2_6_1 package-private by @armanbilge in #4191
Make whenA/unlessA syntax by-name lazy by @catostrophe, @armanbilge in #4207
weaken constraint on ParallelApOps and ParallelApplyOps methods by @jbwheatley in #4078
Prevent Chain instances being backed by mutable or lazy Seq by @bplommer in #4169
Use spurious Fractional[MiniInt] to test Invariant[Fractional] by @tmccarthy in #4216
Expose newtype objects to Mima by @satorg in #4219

Deprecations

Recommend Cats Effect IO as a replacement for every use case of Future by @BalmungSan, @johnynek, @armanbilge in #4230

Any non-pure use of Future with Cats is error prone (particularly the semantics of traverse with regard to execution order are unspecified). We recommend using Cats Effect IO as a replacement for every use case of Future. However, at this time there are no plans to remove these instances from Cats.

See also: #4176 Changes in Future traverse behavior between 2.6 and 2.7

Documentation

Update maintainers by @rossabaker in #4073
cats and category theory in readme by @SethTisue in #4090
Add documentation for Bimonad by @gatear in #4076
readme updates by @SethTisue in #4096
Remove unused type parameter in Choice typeclass doc by @b-vennes in #4113
DocTests for OptionT by @FelAl in #4038
Documentation/update adopters & contibuting by @benkio in #4124
Fix readme by @danicheg in #4141
more doctests to Reducible by @dseer0 in #4148
Minor typo by @lodamar in #4164
Fix graphic in README by @armanbilge in #4174
Add copyright notices and Scala license for code derived from the standard library by @DavidGregory084 in #4196
adding all three Bartosz Milewski's parts for the Category Theory for Programmers course by @gokyo in #3992
Readme: Remove references to old Scala versions by @bplommer in #4213
Fix broken URLs in README.md by @maksymilianrozanski in #4218
Make Bifoldable docs by @gatear in #4109
StateT Documentation by @benkio in #4126

Adopters

add lego and disney by @kailuowang in #4087
Add iofod to users by @qkorbit in #4095
Added OVO Energy to the list by @CoderDanUK in #4110
add ClearScore to Adopters by @LydiaSkuse in #4155
Prometeus -> Prometheus by @Marcus-Rosti in #4198
Add Cognite to list of adopters by @hakontro in #4201
Update README.md by @OnAirEntertainment-Scala in #4205
Add Etsy as an adopter by @JasnaMRB in #4217

Behind-the-scenes

Rm Jabba index by @danicheg in #4081
Rename isDotty -> isScala3 by @armanbilge in #4119
Clean up GenTupleParallelSyntax by @danicheg in #4127
Reduce compilation warnings in tests by @satorg in #4083
Migrate to sbt-typelevel by @armanbilge in #4160
Build cleanups by @armanbilge in #4181
temporarily disable tlFatalWarningsInCi by @satorg in #4186
Add Scala Steward conf by @danicheg in #4197
Remove unnecessary MiMa filters by @armanbilge in #4204
Remove simulacrum by @BalmungSan in #4210
Add new maintainers to developer list by @armanbilge in #4237

Updates

Update scalafmt-core to 3.2.0 by @scala-steward in #4058
Update sbt-github-actions to 0.14.0 by @scala-steward in #4064
Update scalafmt-core to 3.2.1 by @scala-steward in #4069
Update sbt-scalafmt to 2.4.5 by @scala-steward in #4071
Update auxlib, javalib, nativelib, nscplugin, ... to 0.4.2 by @scala-steward in #4072
Update discipline-core to 1.4.0 by @scala-steward in #4074
Update sbt to 1.5.6 by @scala-steward in #4080
Update sbt to 1.5.7 by @scala-steward in #4085
Update snakeyaml to 1.30 by @scala-steward in #4086
Update sbt to 1.5.8 by @scala-steward in #4091
Update sbt-scalafmt to 2.4.6 by @scala-steward in #4098
Update sbt to 1.6.0 by @scala-steward in #4099
Update sbt to 1.6.1 by @scala-steward in #4100
Update scalafmt-core to 3.3.0 by @satorg in #4101
Update sbt-scalafix to 0.9.34 by @scala-steward in #4107
Update scala-library, scala-reflect to 2.13.8 by @scala-steward in #4111
Update auxlib, javalib, nativelib, nscplugin, ... to 0.4.3 by @scala-steward in #4115
Update scalafmt-core to 3.3.3 by @scala-steward in #4116
Update scalafmt-core to 3.4.0 by @scala-steward in #4121
Update sbt to 1.6.2 by @scala-steward in #4122
Update scalafmt-core to 3.4.2 by @scala-steward in #4129
Update...

@satorg

The most significant change in this release is the incorporation of the Typelevel Algebra project within Cats. Cats has long been the primary downstream dependent of this library, and it has significant overlap with a lot of the Cats core mission. Note that this change was made without breaking binary compatibility for transitive downstream users of Algebra, meaning that the package remains algebra rather than the more-conventional cats.algebra. This will be adjusted in Cats 3, which has no timeline at present.

Additions

#4052 Optimize Alternative (part 2): add prependK/appendK specializations for std containers by @satorg
#4014 optimize Alternative (part 1): introduce NonEmptyAlternative with prependK and appendK methods by @satorg
#3931 Add missing methods to VectorOps by @satorg
#4036 Adding Id.apply by @BalmungSan
#4032 Invariant[Fractional] by @tmccarthy
#4029 Add parReduceMapA by @isomarcte
#4007 Introduce parReplicateA by @RafalSumislawski
#4015 Implement OptionT#foreachF by @armanbilge
#3979 Add Semifield and CommutativeSemifield to algebra by @armanbilge
#3963 NonEmptyMap: add new methods by @satorg
#3987 Implement InvariantCoyoneda by @armanbilge

Changes

#3997 Relax a constraint for Alternative's unite and separate methods from Monad to FlatMap by @satorg
#4044 Incorrect deprecated messages by @jmgimeno
#4046 Add missing else keyword to example by @Steve
#4040 Add Adobe CCA team as users of Cats by @gatear
#4039 Remove out-of-date comment by @TimWSpence
#4037 Typo fix: ',' instead of '=>' by @JakubSzczerbinski
#4026 Using cats.syntax.all instead of cats.implicits in the docs by @BalmungSan
#4024 Add library Jms4s to the ecosystem page by @benkio
#4017 Adding Medidata as an Adopter in the README.md by @tmilner
#4013 Add SEEK Limited to Adopter list by @bjing
#4005 Typelevel ecosystem broken links fix by @benkio
#3944 add identity hash to alleycats by @SimY4
#3985 Add NetworkedAssets to adopters list by @RafalSumislawski
#3984 Use OpenCollective GraphQL API to render sponsors by @armanbilge
#3918 Binary-compatibly move typelevel/algebra into cats repo by @armanbilge
#3972 Render sponsors from Open Collective REST API by @rossabaker
#3967 override toIterable more and use it by @johnynek
#3960 Fix traverse_ for List and Vector to be stack safe by @johnynek
#3949 Added implementation of Eq[Free] by @djspiewak
#3956 Configure microsite image directory by @rossabaker
#3958 Eq[NonEmptySet[A]] now needs Eq[A], not Order[A] by @domaspoliakas
#3945 Cleanup ScalaStyle things by @danicheg
#3951 Override map2Eval in FlatMap by @vasilmkd
#3943 Use new sbt syntax for fmt commands by @danicheg
#3932 Add Tranzzo to adopters list by @gorbylov
#3894 Test FunctionK in scala 3 by @bplommer
#3893 Deprecate ifA by @diesalbla
#3909 Add doctests to Bifoldable by @brs96
#3906 Move Id instances into implicit scope for Scala 3 by @joroKr21

There are no noteworthy additions in this release, but it is the first Cats release for Scala 3!

@TimWSpence

Cats 2.6.0 is a binary-compatible release in the 2.x series. It provides support for Scala 2.12, 2.13, 3.0.0-RC2 and 3.0.0-RC3.

Additions

#3831 Add composition to Representable by @TimWSpence
#3832 Representable instance for Tuple2K by @TimWSpence
#3837 Provide instance of Alternative[Set] in alleycats by @rtyley
#3836 RepresentableStoreT by @TimWSpence

Changes

#3847 Make deprecated catsDataInstancesForNonEmptyMap not implicit by @joroKr21 (source breaking)
#3720, #3852 fix show interpolation ambiguity with Seq/List by @tnielens
#2254, #3856 Remove redundant Monad constraints from Parallel syntax by @joroKr21
#3851 Update 'Jump Start Guide' page to modern cats by @chaitanyawaikar

@nikiforo

Cats 2.5.0 is a binary-compatible release in the 2.x series. It provides support for Scala 2.12, 2.13, 3.0.0-RC1 and 3.0.0-RC2.

Additions

#3808 Chain add fromOption factory method by @nikiforo
#3826, #3827 Add syntax for parProduct and parAp by @nigredo-tori
#3804, #3805 Add Ior.mergeWith and AlignMergeWith by @nigredo-tori
#3806 Add Align instance for Nested by @nigredo-tori
#3643, #3823 Add sumAll & productAll by @phongngtuan, @larsrh

Changes

#3818 update Scala to 2.13.5 by @sh0hei
#3825 Use -scalajs-mapSourceURI in Scala 3 builds by @fthomas
#3377, #3807 Replace Band instance for NonEmptyMap with a Semigroup instance consistent with SortedMap by @nigredo-tori
#3480, #3833 Rename master to main by @travisbrown, @larsrh

Documentation

#3814 typo in ApplicativeError by @wibisono

@ashleymercer

Cats 2.4.2 is a small maintenance release, with added support Scala 3.0.0-RC1.

Additions

#3793 Add BoundedEnumerable.reverse by @ashleymercer

Changes

#3799 Fix scalafix rewriting for Foldable typeclass by @catostrophe
#3801 Build for Scala 3.0.0-RC1 by @djspiewak
#3792 Revert implicitness of Empty.fromEmptyK @joroKr21

Releases: typelevel/cats

v2.12.0

What's Changed

Features

Behind-the-Scenes

Updates

New Contributors

Contributors

v2.11.0

What's Changed

Features

Optimizations

Fixes

Documentation

Behind-the-scenes

Updates

New Contributors

Contributors

v2.10.0

What's Changed

Features

Optimizations

Fixes

Documentation

Adopters

Behind-the-scenes

Updates

New Contributors

Contributors

v2.9.0

What's Changed

Features

Optimizations

Fixes

Deprecations

Documentation

Behind-the-scenes

Updates

New Contributors

Contributors

v2.8.0

Features

Optimizations

Fixes

Deprecations

Documentation

Adopters

Behind-the-scenes

Updates

Contributors

Cats 2.7.0

Additions

Changes

Contributors

Cats 2.6.1

Cats 2.6.0

Additions

Changes

Cats 2.5.0

Additions

Changes

Documentation

Cats 2.4.2

Additions

Changes