{"id":63393,"library":"cats-kernel-2-12","title":"Cats Kernel","description":"Cats kernel provides the core type classes and data structures for the Cats functional programming library for Scala.","status":"active","version":"2.13.0","language":"java","source_language":null,"source_url":"https://github.com/typelevel/cats","tags":["cats","functional","scala","typeclasses"],"install":[{"cmd":"<dependency>\n  <groupId>org.typelevel</groupId>\n  <artifactId>cats-kernel_2.12</artifactId>\n  <version>2.13.0</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.typelevel:cats-kernel_2.12:2.13.0'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"Semigroup","correct":"cats.kernel.Semigroup"}],"quickstart":{"code":"import cats.kernel.Semigroup;\n\npublic class Quickstart {\n    public static void main(String[] args) {\n        Semigroup<Integer> semigroup = Semigroup.instance();\n        System.out.println(semigroup.combine(1, 2));\n    }\n}","lang":"java","description":"Uses the Semigroup type class from Cats kernel."},"warnings":[],"env_vars":null,"search_vec":"'cat':1,3,15,21 'class':9 'core':7 'data':11 'function':16,22 'kernel':2,4 'librari':18 'program':17 'provid':5 'scala':20,23 'structur':12 'type':8 'typeclass':24","created_at":"2026-06-17T16:43:28.039275+00:00","updated_at":"2026-06-17T16:43:28.039275+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-kernel_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":"2026-06-17","next_check":"2026-12-14","install_tag":null}}