30 open-source projects similar to gcanti/fp-ts, ranked by shared indexed features. Tags may describe platforms or build tools rather than the same primary purpose. Check each project’s use case, license, and deployment requirements before treating it as a replacement.
Cats is a Scala functional programming library and type class library designed to implement algebraic patterns and functional abstractions. It provides a standardized set of interfaces and a modular toolkit of functional wrappers and containers to enable ad-hoc polymorphism and generic programming across disparate types. The project serves as a functional abstraction standard, offering a monad transformer suite to compose nested effectful contexts and handle multiple computational side effects within a single pipeline. It further enables the construction of embedded domain-specific languages
PureScript is a statically typed, purely functional programming language that compiles to JavaScript. It is designed as a cross-platform frontend language for building safe web applications, utilizing a static type system and a JavaScript compiler to ensure program correctness across browser and server environments. The language is distinguished by its emphasis on mathematical purity, featuring a robust type system with first-class support for monads. It provides a sophisticated toolset for static verification, including algebraic data types, type classes, and automatic type inference to reje
Returns is a functional programming library for Python that provides type-safe containers for managing state, error handling, and optionality. It serves as a monadic container library and a type-safe error handling framework, replacing traditional try-catch blocks and null checks with Result and Optional containers to treat exceptions as data. The project is distinguished by its use of a specialized Mypy static analysis plugin to validate functional pipelines and emulate higher kinded types. It provides mechanisms for isolating side effects through IO containers and offers a framework for typ
language-ext is a functional programming framework for C# that provides a suite of immutable data structures and monadic types. It enables the implementation of pure functional programming patterns, utilizing containers to manage side effects, optional values, and error handling. The library is distinguished by its advanced concurrency and state management tools, including a software transactional memory system and lock-free atomic references. It also provides specialized utilities for distributed systems, such as vector clocks for causality tracking and deterministic data conflict resolution
This project is a comprehensive educational guide and curriculum for applying functional programming principles and category theory within the JavaScript ecosystem. It provides a structured learning path focused on writing predictable and scalable code through the use of pure functions and immutability. The resource includes a dedicated course on algebraic data structures and a functional programming tutorial. To reinforce theoretical concepts, it features a set of interactive coding exercises and runnable programming challenges for hands-on practice. The materials cover a broad range of fun
This project is a collection of curated guidelines and manuals for writing clean, idiomatic, and maintainable code in Scala. It serves as a comprehensive guide for Scala coding standards, functional programming design, and enterprise software architecture. The repository provides specific strategies for concurrency management, including patterns for actors, futures, and thread pools to ensure thread safety. It also contains a performance optimization manual focused on reducing memory allocations and managing garbage collection pressure to improve runtime efficiency. The guides cover a broad
ZIO is a functional effect system for the JVM that models asynchronous and concurrent programs as pure, composable values with typed error handling and dependency injection. Its core identity is built on fiber-based concurrency, where lightweight, non-blocking fibers execute millions of concurrent tasks with structured lifecycle management, and a dual-channel error model that separates expected business failures from unexpected system defects at compile time. The system provides effect-typed dependency injection through a layer-based dependency graph, pull-based reactive stream processing with
Borgo is a statically typed language and compiler that transforms high-level syntax into Go source code. It functions as a transpiler designed to leverage the Go runtime while introducing a type system centered on algebraic data types and result-based error handling. The language distinguishes itself by replacing Go's multiple return values with result and option types, using a dedicated operator for concise error propagation. It implements sum types with exhaustive pattern matching and provides a tool to generate bindings for existing Go packages, automatically converting multi-value returns
This project is a functional programming compiler and JavaScript transpiler that transforms a statically typed language into optimized JavaScript for web browsers. It serves as a frontend architecture framework, providing a static type system and a package manager that enforces semantic versioning. The compiler uses a type-checking engine with automatic type inference to prevent runtime errors and guide code refactoring. It implements a structural pattern for managing application state and rendering user interfaces through a virtual DOM, utilizing immutable data and purity-based state transit
This project is a comprehensive educational resource and programming course covering C++ language semantics and features from C++03 through C++26. It provides structured tutorials and technical guides focused on modern C++ development. The material offers specialized instruction on template metaprogramming, including the use of type traits and compile-time computations. It features detailed guides on concurrency and parallelism for multi-core execution, as well as a reference for software design applying SOLID principles and RAII. Additionally, it covers build performance optimization to redu
Concurrent Ruby is a comprehensive concurrency toolkit for the Ruby language that provides thread-safe data structures, synchronization primitives, and asynchronous execution patterns. It implements core concurrency abstractions including an actor model framework where isolated actors communicate through asynchronous message passing, a future and promise system for composing non-blocking operations, and thread pool executors that manage reusable worker threads for concurrent task execution. The library distinguishes itself through a broad set of coordination mechanisms that go beyond basic th
This project is a comprehensive functional programming curriculum and learning resource for Haskell. It provides sequenced educational paths and technical reference guides designed to take developers from beginner to advanced levels of proficiency. The project distinguishes itself through a deep focus on theoretical and technical foundations, offering detailed studies on type theory, category theory, and runtime internals. It includes a dedicated performance handbook for optimizing execution speed and memory management, as well as an ecosystem guide for managing development tools and editor c
Gleam is a statically typed, functional programming language designed for building scalable and maintainable applications. It operates as a cross-platform development ecosystem that compiles source code to run on the Erlang virtual machine or within JavaScript environments. The language integrates a package manager and build system that automates dependency resolution, project compilation, and the generation of software bills of materials. The language distinguishes itself through a focus on type-driven domain modeling and a robust foreign function interface framework. By encoding business ru
Reason is a strongly typed functional language and multi-target compiler designed to produce either JavaScript for web environments or native machine code for operating systems. It serves as an OCaml-compatible language that shares an abstract syntax tree with OCaml, providing a practical syntax for the OCaml ecosystem. The project functions as a type-safe frontend language, incorporating JSX support to build user interfaces through structural elements that translate into type-safe function calls. It enables deep integration with the JavaScript ecosystem, allowing the use of existing librarie
Redux is a JavaScript state management library that serves as a centralized state container for application data. It operates as a predictable state machine, maintaining the entire application state in a single immutable object tree to ensure a consistent source of truth. The library enforces a unidirectional data flow architecture where the state is read-only and can only be modified by dispatching action objects. State transitions are calculated by applying pure reducer functions to the current state and a specific action, ensuring that data updates are deterministic and trackable. The sys
ReSwift is a unidirectional data flow framework for Swift applications that centralizes state management within a single store. It ensures predictable and traceable updates by requiring all state modifications to occur through explicit actions processed by reducer functions. The library includes a state time travel debugger that records and replays sequences of actions to reload or rewind the application state. It also provides an asynchronous action dispatcher to handle side effects and network requests while maintaining synchronized state updates. The framework covers a broad surface of st
Arrow is a functional programming library for Kotlin that provides tools for implementing data-oriented programming patterns. It serves as a framework for typed error handling, a concurrency toolkit, and a library for the manipulation of immutable data. The project distinguishes itself through specialized capabilities for managing application failures using explicit types instead of exceptions and implementing resilience patterns such as circuit breakers and retry policies for distributed services. It also provides optics to update and query deeply nested immutable data structures without man
Frege is a purely functional programming language that compiles to JVM bytecode, providing Haskell-like semantics for the Java platform. It is built around a Haskell-inspired compiler that implements non-strict evaluation and a static type inference system to ensure data immutability and prevent side effects. The project distinguishes itself through a sophisticated type system featuring rank polymorphism, type-class based dispatch, and static purity enforcement. It includes a JVM language bridge and a foreign function interface that map Java classes and interfaces into functional types, allow
libextobjc is an Objective-C language extension library and runtime toolset that provides functional programming patterns and advanced dynamism. It functions as a collection of utilities for method injection, class reflection, and static analysis to help prevent runtime crashes. The library enables the generation of algebraic data types at compile-time and provides a mechanism for synthesizing backing instance variables for properties defined within categories. It also implements protocol default behaviors and provides tools for validating key paths and selectors during the compilation proces
EasyTransaction is a distributed transaction framework that coordinates data consistency and failover across independent microservices. It implements unified patterns such as SAGA, Try-Confirm-Cancel, and reliable messaging to handle multi-service operations and failures safely. The framework combines diverse transaction styles and nests operations to manage complex workflows without relying on central coordinators. It includes an automatic compensation engine that executes reverse operations and rollback workflows sequentially when downstream failures occur, alongside an automated crash reco
Cello is a programming language extension for C that provides a higher-level implementation of the language. It integrates an object-oriented framework, an automated garbage collection system, and a runtime reflection library to enable dynamic type inspection. The project implements a structured system for object orientation within C, including support for classes, type classes, and polymorphism. It includes a runtime exception handling system to intercept execution errors and initiate recovery procedures. The framework further provides generic programming capabilities for creating reusable
Go Package of validators and sanitizers for strings, numerics, slices and structs
Pyrefly is a static type checker for Python that operates as a language server, delivering real-time diagnostics, completions, and navigation in any editor supporting the Language Server Protocol. It also performs static tensor shape analysis, using symbolic dimension variables and arithmetic to verify shape consistency in deep learning models without runtime execution. Beyond core type checking, Pyrefly supports gradual adoption workflows: it can generate a baseline of known errors so only new issues are reported, migrate configuration from other type checkers, and automatically suppress exi
Robot is a functional and immutable finite state machine library for managing declarative application states and transitions. It utilizes an immutable state transition engine where next states and side effects are computed through pure functions operating on immutable data structures without any side-effect mutations. States and allowed transitions are mapped in a declarative state table definition, making the overall state machine logic readable and inspectable. The library connects finite state machines directly to component rendering engines through component reactive bindings, ensuring th
The php-standard-library is a comprehensive toolkit for functional programming and asynchronous networking in PHP, featuring typed data structures, structured concurrency, and composable validation mechanisms. It provides explicit result types and pure collection transformers that separate lists from dictionaries, eliminating traditional array key confusion and error-throwing patterns. The library supports concurrent execution through lightweight user-space fibers, message-passing channels, and non-blocking event loops, driving asynchronous TCP, TLS, UDP, and Unix socket servers without relyi
This project is an educational guide and tutorial for the Elm application architecture. It provides instruction on implementing functional state management and modular architectural patterns for user interfaces. The tutorial focuses on the model view update pattern, utilizing a single source of truth for centralized state management. It demonstrates how to use discrete message types to trigger state transitions through pure update functions, ensuring a unidirectional data flow from view events back to the view. The material covers declarative UI development, transforming application state in
c3c is the compiler for the C3 programming language, transforming source code into executable binaries, static libraries, or dynamic libraries using an LLVM backend. It implements a system based on result-based error handling, scoped memory pooling, and a semantic macro system. The compiler provides first-class support for hardware-backed SIMD vectors that map directly to processor instructions and enables runtime polymorphism through interface-based dynamic dispatch. The project covers a broad set of low-level capabilities, including manual and pooled memory management, inline assembly inte
Inngest is a durable execution framework and event-driven automation engine designed to orchestrate background workflows. It enables developers to build resilient, stateful processes by memoizing function steps, ensuring that long-running tasks can automatically resume from the last successful operation after failures, timeouts, or infrastructure restarts. The platform distinguishes itself through its event-driven architecture, which uses a schema-validated bus to trigger functions and coordinate complex, multi-step logic. It employs an onion-model middleware approach for cross-cutting concer
This project is a comprehensive guide to architectural patterns and design techniques for building modular user interfaces with React. It focuses on structuring component hierarchies, implementing state management patterns, and decoupling services to ensure applications remain maintainable and scalable. The collection emphasizes strategies for dependency injection and the separation of business logic from presentation layers. It provides detailed approaches for utilizing containers, higher-order components, and module registries to isolate external services and third-party libraries from the
This project is a comprehensive collection of reference materials, including a language cheatsheet, a standard library reference, and a concurrency reference. It serves as a guide to modern C++ development, focusing on language syntax, standard library utilities, and template metaprogramming patterns. The repository provides specific guidance on template metaprogramming through a dedicated guide covering compile-time evaluation, type deduction, and variadic template execution. The materials cover a broad range of capabilities, including asynchronous programming, memory management, and system