{"id":56118,"library":"cats-free-2-12","title":"Cats Free (Scala 2.12)","description":"Cats library providing free monads and free applicatives for functional programming in Scala.","status":"active","version":"2.13.0","language":"java","source_language":null,"source_url":"https://github.com/typelevel/cats","tags":["cats","free","monad","functional","scala"],"install":[{"cmd":"<dependency>\n  <groupId>org.typelevel</groupId>\n  <artifactId>cats-free_2.12</artifactId>\n  <version>2.13.0</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.typelevel:cats-free_2.12:2.13.0'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"Free","correct":"cats.free.Free"}],"quickstart":{"code":"import cats.free.Free\nimport cats.instances.all._\n\nsealed trait KVStore[A]\ncase class Put(key: String, value: String) extends KVStore[Unit]\ncase class Get(key: String) extends KVStore[Option[String]]\n\ntype KVStoreFree[A] = Free[KVStore, A]","lang":"scala","description":"Minimal Scala example defining a free monad for a key-value store."},"warnings":[{"fix":"Ensure you use the correct Scala version suffix (e.g., _2.13 for Scala 2.13, _3 for Scala 3).","message":"This artifact is for Scala 2.12; use the appropriate version for your Scala version (e.g., cats-free_2.13).","severity":"breaking","affected_versions":"*"}],"env_vars":null,"search_vec":"'2.12':4 'applic':12 'cat':1,5,18 'free':2,8,11,19 'function':14,21 'librari':6 'monad':9,20 'program':15 'provid':7 'scala':3,17,22","created_at":"2026-06-15T10:21:24.483195+00:00","updated_at":"2026-06-15T10:21:24.483195+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-free_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}}