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  • v1.6.0 Changes

    2019 Jan 31

    🚀 Cats 1.6.0 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1, 1.1.0, 1.2.0, 1.3.1, 1.4.0 and 1.5.0 jars. 1.6.0 is mostly identical to 1.6.0-RC1 except one additional feature enhancement.

    • #2709 Adds version of mkString_ with no prefix/suffix, matching the std lib. by @matthughes

  • v1.6.0-RC1 Changes

    2019 Jan 22

    🚀 Cats 1.6.0-RC1 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1, 1.1.0, 1.2.0, 1.3.1, 1.4.0 and 1.5.0 jars.

    It brought you:

    12 API/Feature enhancements

    • #2641 Adding partitionEitherM by @blast-hardcheese
    • #2609 Add an If-Then-Else operation to the Apply. by @diesalbla
    • #2606 Add syntax for Bitraverse to allow traversal and sequencing of the left side by @andimiller
    • #2600 Add sequenceFilter syntax by @kubukoz
    • #2563 Add an applyK function to Kleisli. by @diesalbla
    • #2450 Add Kleisli#mapK equivalent returning FunctionK by @kubukoz
    • #2292 Add foldMapK, reduceMapK by @kubukoz
    • #2693 Add IndexedState alias (#2686) by @valydia
    • #2690 Override equals and hashCode on Chain by @ceedubs
    • #2671 add syntax <&> for parallel by @jcouyang
    • #2655 Add rethrowT method to EitherT by @bplommer
    • 🚚 #2647 Move cats.tests.ListWrapper to cats-testkit by @ArturGajowy

    🛠 3 bug fixes

    • ⏪ #2702 Reverted binary incompatible changes to generated parallel syntax by @barambani
    • #2692 Private val in value classes (Resolve TODO since 2.10 is dropped) by @barambani
    • #2670 Issue 2657 - Ambiguous duration instances by @barambani

    📚 17 documentation additions/fixes

    • ⚡️ #2642 Update table headers and clarify method signature for flatTap by @mtomko
    • #2636 Some changes to glossary. by @diesalbla
    • #2630 Fix a typo in Chain's doc by @satansk
    • #2627 A bit clarification on PULL Request template by @kailuowang
    • #2625 Fix type signature of productL in cats glossary by @mtomko
    • #2622 Fix documented constraint on B param in foldMapM by @ksonj
    • 🚚 #2574 Remove duplicate menu item in docs by @petern-sc
    • #2277 Add an explanation for the missing Applicative instances for monad transformers by @kubukoz
    • ⚡️ #2700 update the copyright by @RafalSladek
    • #2699 typo in Comanad[Try] by @philipschwarz
    • 🙋 #2684 Fix FAQ formatting error by @ceedubs
    • 📚 #2677 Write documentation for ContT by @cb372
    • #2668 Fix broken link to Arrow.scala by @DieBauer
    • #2665 minor fix by @kailuowang
    • 📄 #2664 Cleaning up docs to no longer use fine grained imports by @calvinbrown085
    • 🏗 #2659 change prePR to run BC test on Scala 2.11 build by @kailuowang
    • #2656 Fix instructions for checking binary compatibility by @bplommer

    🏗 10 build improvements

    • ⚡️ #2637 Update kind-projector to 0.9.9 by @scala-steward
    • #2619 Use composite projects by @Alistair-Johnson
    • ⚡️ #2703 Update simulacrum to 0.15.0 by @scala-steward
    • 🏗 #2691 Don't send Gitter notifications for fork builds by @ceedubs
    • 🚀 #2681 Update sbt-release to 1.0.11 by @scala-steward
    • 🏗 #2674 minor fix to build by @kailuowang
    • ⚡️ #2660 Update tut-plugin to 0.6.10 by @scala-steward
    • #2654 Add a shell.nix and instructions for using it by @ceedubs
    • ⚡️ #2652 Update SBT 1.2.7 by @ChristopherDavenport
    • ⚡️ #2643 Update sbt-scalajs, scalajs-compiler, scalajs-library... to 0.6.26 by @scala-steward

  • v1.5.0 Changes

    2018 Nov 30

    🚀 Cats 1.5.0 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1, 1.1.0, 1.2.0, 1.3.1 and 1.4.0 jars.

    🚀 The artifacts are identical to Cats 1.5.0-RC1. For changes since 1.4.0 please check release notes of Cats 1.5.0-RC0 and Cats 1.5.0-RC1.

  • v1.5.0-RC1 Changes

    2018 Nov 19

    🚀 Cats 1.5.0-RC1 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1, 1.1.0, 1.2.0, 1.3.1 and 1.4.0 jars.

    It brought you:

    5 API/Feature enhancements

    • #2610 Expose headOption for Chain by @ChristopherDavenport
    • #2596 Add standalone Try syntax import by @kubukoz
    • #2594 Get FunctorFilter on par with the other MTL typeclasses by @barambani
    • #2588 Add flap function to Apply by @ssanj
    • #2506 Add ContT monad by @johnynek

    ✅ 1 test improvment

    • ✅ #2578 Add awk script to parse test durations by @ceedubs

    🛠 5 bug fixes

    • #2618 Issue 2608 - Ambiguous implicit values for Functor[Kleisli[F, A, ?]] by @barambani
    • 💅 #2617 Make the vals inside all 'Ops' style classes private by @coltfred
    • #2615 2611 - MonadError syntax for OptionT uses incorrect instance by @barambani
    • #2614 Make the value of the class private by @coltfred
    • #2603 Rename EitherT.biflatMap by @ochrons

    🏗 1 build improvement

    • 🏗 #2605 Reduce Xmx in .jvmopts and build.sbt by @Alistair-Johnson

  • v1.5.0-RC0 Changes

    2018 Nov 8

    🚀 Cats 1.5.0-RC0 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1, 1.1.0, 1.2.0, 1.3.1 and 1.4.0 jars.

    1.5.0-RC0 brought

    23 API/Feature enhancements

    • ⚡️ #2597 Optimize Apply methods in FlatMap by @kailuowang
    • ⚡️ #2592 Add updateWith method to NonEmptyMap by @nasadorian
    • #2579 Added Chain#distinct and NonEmptyChain#distinct to match List#distinct and NonEmptyList#distinct by @fmsbeekmans
    • #2573 Add biFlatMap to EitherT by @agajek
    • #2557 Add NonEmptyList#toNes (issue #2346) by @CucumisSativus
    • #2555 Add OptionOps.toInvalidNec and OptionOps.toValidNec by @ybasket
    • ⚡️ #2552 Optimize the foldM implementation for Vector by @ceedubs
    • #2548 Missing Contravariant instance for OptionT by @barambani
    • #2544 Adding FiniteDuration instances by @calvinbrown085
    • #2543 Adding Nes and Nec equivalents of Nel functions by @calvinbrown085
    • #2541 Add NonEmptyList#toNem (issue #2346) by @CucumisSativus
    • #2535 Add NonEmptyMap#toNonEmptyList (issue #2346) by @CucumisSativus
    • 🗄 #2534 avoid deprecated macro APIs post 2.10 by @larsrh
    • #2533 Add empty to State and StateT objects by @larsrh
    • #2527 align type parameter of smart constructor with Validated (#2525) by @thoefer
    • #2522 added Convenience functions for Ior NonEmptyChain by @binkabir
    • 🛠 #2521 fixed eqv alias issue #2513: by @binkabir
    • #2520 Add count as syntax to UnorderedFoldable by @leusgalvan
    • #2515 Add Duration Instances to cats.instances.all and cats.implicits by @LukaJCB
    • 👀 #2511 .raiseError syntax allows an error subtype by @guersam
    • #2510 Add Pure instance for Future by @danslapman
    • #2487 Add toValidatedNec to Validated by @satansk
    • #2475 Add Either#toEitherNel extension and friends by @kubukoz

    1 bug fix

    • 0️⃣ #2586 UnorderedFoldable#isEmpty default implementation is incorrect by @barambani

    📚 16 documentation additions/fixes

    • #2576 Contributing guidelines link by @fmsbeekmans
    • 📄 #2572 Add Alternative docs by @stephen-lazaro
    • #2566 Add Tuple2 Example for Bifunctor by @stephen-lazaro
    • 🛠 #2564 Fixed typo in the docs by @barambani
    • #2558 Add Nomenclature / Cheatsheet page by @diesalbla
    • #2554 Adding the cats friendly badge link to README by @calvinbrown085
    • #2550 Proposal: add cats-collections as an external cats module by @kailuowang
    • 🙋 #2549 Add FAQ for monad transformer variance by @ceedubs
    • 📚 #2547 Fix link for contributing documentation by @ceedubs
    • ⚡️ #2537 Updating Year. by @shankarshastri
    • 📚 #2528 fix typo in validated documentation by @ssanj
    • #2524 cats logo as svg and new "cats friendly" badge by @thoefer
    • #2512 Add definition of point-wise to README by @AaronDelaplane
    • 📄 #2505 Add Chain docs by @LukaJCB
    • 📄 #2472 Replace List with Chain in Validated's docs by @satansk
    • 📚 #2459 Add documentation for FlatMap and Bifunctor by @asoltysik

    🏗 20 build improvements

    • ⚡️ #2591 Update tut-plugin to 0.6.9 by @scala-steward
    • 🚀 #2590 Update sbt-release to 1.0.10 by @scala-steward
    • ⚡️ #2589 updated to 2.13-M5 by @kailuowang
    • #2583 added a prePR command and PR template to remind people to run it by @kailuowang
    • ✅ #2581 Fix test fork settings I think by @ceedubs
    • ✅ #2568 give test more memory by @kailuowang
    • 🏗 #2565 Disable Scala Native build for kernel by @agajek
    • #2562 Introduce Scalafmt by @joan38
    • ⚡️ #2507 Update sbt to 1.2.3 by @fthomas
    • ⚡️ #2503 Update sbt-jmh to 0.3.4 by @scala-steward
    • ⚡️ #2502 Update tut-core to 0.6.7 by @scala-steward
    • ⚡️ #2501 Update sbt-scala-native to 0.3.8 by @scala-steward
    • ⚡️ #2499 Update sbt-crossproject to 0.6.0 by @scala-steward
    • ⚡️ #2497 Update partial-unification to 1.1.2 by @scala-steward
    • ⚡️ #2496 Update sbt-git to 1.0.0 by @scala-steward
    • ⚡️ #2495 Update sbt-pgp to 1.1.2 by @scala-steward
    • 🚀 #2494 Update sbt-release to 1.0.9 by @scala-steward
    • ⚡️ #2493 Update sbt-unidoc to 0.4.2 by @scala-steward
    • ⚡️ #2492 Update sbt-travisci to 1.1.3 by @scala-steward
    • 🚚 #2382 Removed not used sbt-scala-native plugin and fixed importing the project into intellij by @LukaszMarchewka

    ✅ 2 test improvments

    • ✅ #2523 Add doctests for Semigroup, Group, and Monoid enhancement by @DennisVDB
    • ✅ #2509 Adding tests for binary compat that can't be tested by Mima by @kailuowang

  • v1.4.0 Changes

    2018 Sep 12

    🚀 Cats 1.4.0 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1, 1.1.0, 1.2.0, and 1.3.1 jars. 🚀 Cats 1.3.1 introduced an unnecessary runtime dependency (scala-collection-compat), this 1.4.0 release removes it.

    1.4.0 also brought you:

    🛠 2 Bug fixes

    • #2488 Kill scala-collection-compat by @travisbrown
    • #2423 Fix NestedIdOps.value leaking to types of shapes F[G[A]] by @zarthross

    4 API Enhancements

    • #2480 improve interaction with subtyping in OptionOps#liftTo by @mberndt123
    • #2452 Add filterFold and collectFold to Foldable by @satansk
    • ✅ #2426 Enrich return type for Representable.apply and add doctests by @ceedubs
    • #2477 Add Order#fromLessThan by @vlovgr

    📚 7 Documentation Additions/Fixes

    • #2485 Proposal - add cats-tagless as an external module by @kailuowang
    • 💅 #2483 Add examples to Functor and verify with docstyle by @YuvalItzchakov
    • 🚚 #2481 moved a couple of ecosystem project to more accurate section by @kailuowang
    • #2478 Made it slightly easier to add a Cats ecosystem project by @kailuowang
    • #2476 add nezasa to adopters list by @rethab
    • #2461 Fix typo in CHANGES by @asakaev
    • 📄 #2234 Fix CONTRIBUTING docs by @asakaev

  • v1.3.1 Changes

    2018 Sep 5

    🚀 Cats 1.3.1 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1, 1.1.0 and 1.2.0 jars. 👍 Cats 1.3.1 does not support Scala 2.10.

    🚀 This is a bug fix release that fixed the binary compatibility breakage when summoning Monad[OptionT[F, ?]] in 1.3.0

  • v1.3.0 Changes

    2018 Sep 4

    🚀 ~Cats 1.3.0 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1, 1.1.0 and 1.2.0 jars.~ There is a bug in this release that breaks binary compatibility when summoning Monad[OptionT[F, ?]]. 👍 Cats 1.3.0 does not support Scala 2.10.

    1.3.0 brought you:

    12 API Enhancements

    • #2431 Give NonEmptyChain more presence by @LukaJCB
    • #2421 Add/fix Foldable extensions: findM and collectFirstSomeM by @catostrophe
    • #2416 add append method to NEL by @julien-truffaut
    • #2406 Add NonEmptyChain by @LukaJCB
    • #2405 Add FunctorFilter and TraverseFilter by @LukaJCB
    • #2402 Add Compose instance for Map by @denisrosca
    • #2371 Add Chain by @LukaJCB
    • #2367 add Tuple2K#swap by @aoiroaoino
    • #2366 Add Foldable extension collectFirstSomeM by @catostrophe
    • 📜 #2351 Add parTraverse_ and parSequence_ syntax by @denisrosca
    • #2345 Add one off object for importing lawless Map instances by @andyscott
    • #2314 Adding on flatTransform to OptionT as suggested. by @abhishek7

    1 Bug fix:

    • 🆓 #2383 Monad[Free[Id, ?]] cannot be found by @barambani

    3 Code Cleanups

    • 🚚 #2451 Remove unnecessary semicolons by @satansk
    • #2425 Override size in Chain instance by @ceedubs
    • #2403 use as and void instead of map(_ => ) by @julien-truffaut

    📚 13 Documentation Additions/Fixes

    • #2427 Add scaladoc example for Semigroupal.product by @ceedubs
    • ✏️ #2378 Fix typos detected by github.com/client9/misspell by @seratch
    • ✏️ #2377 Fix minor typos in typeclasses docs by @ksonj
    • 🚚 #2374 proofread: remove extra word by @jarrodu
    • #2373 add new nested to menu by @kailuowang
    • #2372 Add initial adopters list by @kubukoz
    • 📚 #2369 Add a documentation page for Nested by @cb372
    • #2368 fix typo by @letusfly85
    • #2361 Make kittens officially a Cats module (still separate repo) by @kailuowang
    • ⚡️ #2337 Update the outdated FAQ on IO/Task by @ceedubs
    • ✅ #2344 Use sbt-doctest for Defer example by @ceedubs
    • 📄 #2429 Replace all usage of the list Monoid in the docs with the chain Monoid by @jan0sch
    • #2465 fix laws link in CONTRIBUTING by @melrief

    🏗 7 Build and Tests Improvements:

    • 🏗 #2430 Make Chain Arbitraries recursively build concatenations by @johnynek
    • 👍 #2420 Better Chain Arbitrary by @LukaJCB
    • ✅ #2359 tweak a test to compile on latest Scala 2.13 nightlies by @SethTisue
    • #2354 temporarily disable scaladoc on 2.13 by @kailuowang
    • ⚡️ #2335 Updating to scala 2.13-M4 by @kailuowang
    • ⚡️ #2306 Drop 2.10 support / update to 2.13-M4 by @larsrh
    • 🚀 ##2466 remove bench from release by @kailuowang

  • v1.2.0 Changes

    🚀 Cats 1.2.0 is binary compatible with all previous 1.x Cats releases, i.e. its jar is a drop-in replacement for 1.0.1 and 1.1.0 jars.

    🚀 Cats 1.2.0 is also the last non-patch release that supports Scala 2.10. Farewell Scala 2.10.

    1.2.0 brought you:

    24 API Enhancements

    • #2329 Add Representable instance for Eval. by @denisrosca
    • #2325 Add Cofree.ana and Cofree.anaEval. by @andyscott
    • #2315 Add choice syntax. by @catostrophe
    • #2299 2228-add MonadError instance for optionT where F is a Monad. by @heyrutvik
    • #2297 Make cats.data.AndThen public. by @alexandru
    • #2293 added liftTo syntax to Validated. by @kailuowang
    • #2285 Add groupBy for NonEmptySet. by @Obarros
    • #2284 Add Representable Functor enhancemen. by @eli
    • #2279 Add Defer typeclass, laws and implementations. by @johnynek
    • #2274 Adding biSemiflatMap to EitherT (#2269). by @ericaovo
    • #2262 Add .nested syntax.. by @danielkarch
    • #2259 Add a Binested data type. by @iravid
    • ⚡️ #2258 updated trait ComposedFoldable in Composed.scala. by @Zhen
    • #2256 Add .parFlatTraverse and .parFlatSequence syntax. by @Avasil
    • #2253 Add .toOptionT to option syntax. by @marcodippy
    • #2252 Add tapWithF to Kleisli. by @marcodippy
    • #2249 Add some FlatMap loops useful for State and Effects. by @johnynek
    • #2246 Use unit from Applicative. by @johnynek
    • #2243 Add orElse to ApplicativeError. by @barambani
    • #2232 Change override of neqv in Order. by @ceedubs
    • #2219 Add Bimonad instance to NEL and NEV. by @LukaJCB
    • #2217 Add dual categories.. by @sellout
    • #2204 Added commutative apply and applicative to Const. by @barambani
    • #2191 Extend Functor implementation in the Traverse instance of EitherT, OptionT and Tuple2K. by @barambani

    📚 22 Documentation Additions/Fixes

    • #2330 Add droste to project list. by @andyscott
    • #2311 Add Rainier to the cats library list. by @andyscott
    • #2307 Specify the source of the autogenerated boilerplate. by @dadepo
    • 📚 #2303 Change scaladoc link title to "API Documentation". by @Obarros
    • ⚡️ #2291 Update Bitraverse docs. by @Zelenya
    • #2280 add editor setup tips to contrib guide. by @eli
    • #2278 Elaborate on Foldable#collectFirst comment. by @kubukoz
    • #2270 markdown improvements. by @martijnhoekstra
    • ⚡️ #2266 Update 'Scala with Cats' reference in docs. by @guersam
    • #2251 Be more precise about left vs right in Foldable doc. by @ceedubs
    • ⚡️ #2248 Update state.md. by @rsekulski
    • 📜 #2247 Add fastparse-cats to the list of projects. by @johnynek
    • ✅ #2245 clarify law testing's dependency on cats-testkit and scalates. by @kailuowang
    • #2241 Added shims to the ecosystem list. by @djspiewak
    • 📄 #2226 Slight clean up of State docs. by @ceedubs
    • ✅ #2225 Add doctest example for groupByNel. by @ceedubs
    • #2223 replace cats with Cats for consistency in README.md. by @satansk
    • #2222 Port alleycats README.md from the defunct repo. by @longcao
    • ⚡️ #2221 Update contributors guide. by @AlejandroME
    • 🚚 #2218 Remove extra 'a' in eithert.md. by @donaldosalas
    • #2211 2.12.x no longer needs future-tense. by @mattkohl
    • #2178 Add jump start guide. by @PawelLipski

    🏗 12 Build and Tests Improvements:

    • ⚡️ #2302 Update sbt-partial-unification with support for 2.13.0-M4. by @kailuowang
    • #2301 sbt 1.1.6. by @sullis
    • #2298 Replace to new jvm flag. by @jiminhsieh
    • #2265 Add Function To Check All Relevant MiMa Versions. by @ChristopherDavenport
    • ⚡️ #2264 update bin compat versions to 1.0.0 and 1.1.0. by @kailuowang
    • ⚡️ #2260 Update Scala, sbt, and sbt plugins. by @fthomas
    • ⬆️ #2206 upgraded scala 2.12.5. by @kailuowang
    • 🔌 #2205 Use helper addSbtCoursier in project/plugins.sbt. by @BennyHill
    • 👍 #2203 Add support for 2.13.0-M3. by @BennyHill
    • ✅ #2215 Test Show instance for Duration. by @ceedubs
    • ✅ #2214 Check MonadTests for Vector and List. by @ceedubs
    • ✅ #2213 Use poly lambda syntax in FreeApplicative test. @ceedubs

  • v1.1.0 Changes

    Cats 1.1.0 is binary compatible with 1.0.1, i.e. its jar is a drop-in replacement for the 1.0.1 jar.

    1.1.0 brought you:

    15 API Enhancements

    • #2194 Add reject (partial function) method to MonadError by @Wogan
    • #2192 Add valueOrF to EitherT by @denisrosca
    • #2183 Add parTuple by @barambani
    • #2182 Add Foldable, Traverse and Comonad instances to WriterT by @barambani
    • #2179 added liftTo to Try, Either and Option by @kailuowang
    • #2169 Add FreeT.inject helper function (#1534) by @valydia
    • #2159 Added Bitraverse for Ior (#2144) by @V-Lamp
    • #2150 contravariant coyoneda by @tpolecat
    • #2149 Add leftFlatMap to Either by @rohanshah
    • #2146 added leftNel and rightNel syntax by @kailuowang
    • #2143 Add NonEmptySet by @LukaJCB
    • #2141 Add NonEmptyMap by @LukaJCB
    • #2123 Add contains_, foldSmash and mkString_ to FoldableOps by @rsoeldner
    • 🛠 #2119 Fixes type params for OptionT.getOrElse(F) by @fcanedo
    • #2076 Add Endo type alias for (A => A) by @kailuowang

    🛠 4 Bug Fixes

    • 🚚 #2188 Remove calls to PartialFunction.apply, deprecated in 2.12.5 by @BennyHill
    • #2187 Fix #2186: make IndexedStateT stack safe by @alexandru
    • #2185 Fix #1733: make Kleisli.flatMap stack safe by @alexandru
    • #2148 Add missing UnorderedTraverse syntax by @andyscott

    📚 16 Documentation Additions/Fixes

    • ✅ #2196 Add "Law Testing" to side menu to increase visiblity. by @wjlow
    • #2190 Add Ciris to list of projects in readme by @vlovgr
    • #2184 Add Dsl.scala in the cats ecosystem by @Atry
    • ⚡️ #2177 Docs: Updated typeclass instances table by @battermann
    • #2171 adding validation video by @Andrea
    • #2165 Add types in the Kleisli code sample for composition by @jcranky
    • #2156 Fix Spooky scaladoc typo by @jcranky
    • 📚 #2155 Fix broken link in parallel documentation by @allantl
    • #2154 contravariant.md [reversing roles of A and B in commentary to match the code] by @phderome
    • #2153 added ammonite instructions to faq by @kailuowang
    • ⚡️ #2145 Update version in lawtesting docs by @LukaJCB
    • 📚 #2140 Set micrositeDocumentationUrl as root-relative by @calvellido
    • #2134 Minor scaladoc fix for ::: by @jcranky
    • #2125 Wrong link in Eval doc by @gruggiero
    • 👀 #2122 Add doctest example for ApplicativeError.raiseError by @ceedubs
    • #1720 type classes with only defined laws to guideline by @kailuowang

    🏗 4 Build Improvements:

    • 🏗 #2189 split build jvm,add workers to kernel by @BennyHill
    • 🏗 #2164 remove java 7 build by @xuwe
    • ⚡️ #2158 update travis cache settings by @kailuowang
    • ⚡️ #1919 update to sbt 1.0 by @kailuowang