{"id":54303,"library":"cats-core-2-12","title":"Cats Core (Scala 2.12)","description":"Core functional programming abstractions for Scala, including type classes like Functor and Monad.","status":"active","version":"2.13.0","language":"java","source_language":null,"source_url":"https://github.com/typelevel/cats","tags":["scala","functional","typeclasses","cats"],"install":[{"cmd":"<dependency>\n  <groupId>org.typelevel</groupId>\n  <artifactId>cats-core_2.12</artifactId>\n  <version>2.13.0</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.typelevel:cats-core_2.12:2.13.0'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"Functor","correct":"cats.Functor"}],"quickstart":{"code":"import cats.Functor\nimport cats.implicits._\n\nFunctor[List].map(List(1, 2, 3))(_ + 1)","lang":"scala","description":"Maps over a list using the Functor type class."},"warnings":[{"fix":"Switch to cats-core_2.13 for Scala 2.13 or cats-core_3 for Scala 3.","message":"Scala 2.12 specific artifact; use cats-core_2.13 or cats-core_3 for newer Scala versions.","severity":"breaking","affected_versions":"all"}],"env_vars":null,"search_vec":"'2.12':4 'abstract':8 'cat':1,21 'class':13 'core':2,5 'function':6,19 'functor':15 'includ':11 'like':14 'monad':17 'program':7 'scala':3,10,18 'type':12 'typeclass':20","created_at":"2026-06-15T08:58:29.761302+00:00","updated_at":"2026-06-15T08:58:29.761302+00:00","problems":[],"ecosystem":"maven","meta_description":null,"install_score":null,"quickstart_score":null,"quickstart_tag":null,"pypi_latest":null,"cli_name":null,"cli_version":null,"type":"library","homepage":"https://typelevel.org/cats","github":"https://github.com/typelevel/cats","docs":"https://appdoc.app/artifact/org.typelevel/cats-core_2.12/","changelog":null,"pypi":null,"npm":null,"openapi_spec":null,"status_page":null,"smithery":null,"categories":["utility"],"base_url":null,"auth_type":null,"provenance":{"verified_status":null,"verified_at":null,"last_verified":"2026-06-15","next_check":"2026-12-12","install_tag":null}}