#immutability

phel-lang/phel-lang

PHP

88

health

A functional, Lisp-inspired language that compiles to PHP. Inspired by Clojure, Phel brings macros, persistent data structures, and expressive functional idioms to the PHP ecosystem.

higher-kinded-j/higher-kinded-j

Java

77

health

Higher-kinded types, monads and composable effects for Java 25: the Effect Path API for railway-style error handling, advanced optics (lens/prism/traversal) with code generation for records and sealed types, compile-time DTO mapping that reports every bad field, and Spring Boot integration.