{"id":65528,"library":"cats-kernel-2-13","title":"Cats Kernel","description":"Provides core type classes and data structures for functional programming in Scala.","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-kernel_2.13</artifactId>\n  <version>2.13.0</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.typelevel:cats-kernel_2.13:2.13.0'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"Semigroup","correct":"cats.kernel.Semigroup"}],"quickstart":{"code":"import cats.kernel.Semigroup;\n\npublic class Main {\n    public static void main(String[] args) {\n        Semigroup<Integer> semigroup = Semigroup.instance((a, b) -> a + b);\n        System.out.println(semigroup.combine(1, 2));\n    }\n}","lang":"java","description":"Uses a Semigroup instance to combine integers."},"warnings":[],"env_vars":null,"search_vec":"'cat':1,18 'class':6 'core':4 'data':8 'function':11,16 'kernel':2 'program':12 'provid':3 'scala':14,15 'structur':9 'type':5 'typeclass':17","created_at":"2026-06-17T17:11:44.151449+00:00","updated_at":"2026-06-17T17:11:44.151449+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_2.13/","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}}