{"id":56286,"library":"cats-core-sjs1-2-12","title":"Cats Core (Scala.js 1.x, Scala 2.12)","description":"Core functional programming library for Scala, targeting Scala.js 1.x and Scala 2.12.","status":"active","version":"2.13.0","language":"java","source_language":null,"source_url":"https://github.com/typelevel/cats","tags":["cats","functional","scala","scalajs","typelevel"],"install":[{"cmd":"<dependency>\n  <groupId>org.typelevel</groupId>\n  <artifactId>cats-core_sjs1_2.12</artifactId>\n  <version>2.13.0</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.typelevel:cats-core_sjs1_2.12:2.13.0'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"Validated","correct":"cats.data.Validated"}],"quickstart":{"code":"import cats.data.Validated\n\nval result: Validated[String, Int] = Validated.valid(42)","lang":"scala","description":"Using the Validated data type for error handling."},"warnings":[{"fix":"Use cats-core_2.13 or cats-core_3 for other Scala versions.","message":"This artifact is for Scala 2.12 and Scala.js 1.x only; use the appropriate cross-version artifact.","severity":"gotcha","affected_versions":">=2.0.0"}],"env_vars":null,"search_vec":"'1':4,16 '2.12':7,20 'cat':1,21 'core':2,8 'function':9,22 'librari':11 'program':10 'scala':6,13,19,23 'scala.js':3,15 'scalaj':24 'target':14 'typelevel':25 'x':5,17","created_at":"2026-06-15T10:30:05.793034+00:00","updated_at":"2026-06-15T10:30:05.793034+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_sjs1_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}}