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samber / mo

Sponsor
Star 3.4k

🦄 Monads and popular FP abstractions, powered by Go 1.18+ Generics (Option, Result, Either...)

cats go golang task functional programming state fp generics monad io monoid typesafe future optional option result maybe either
  • Updated Aug 17, 2026
  • Go

tvaneerd / cpp17_in_TTs

Star 1.2k

Descriptions of C++17 features, presented mostly in "Tony Tables" (hey, the name wasn't my idea)

cpp concepts template-metaprogramming cpp17 optional variant tony-tables structured-bindings
  • Updated Jun 16, 2021

kittinunf / Result

Sponsor
Star 935

The modelling for success/failure of operations in Kotlin and KMM (Kotlin Multiplatform Mobile)

kotlin functional optional result kotlin-multiplatform kotlin-multiplatform-library
  • Updated Feb 9, 2026
  • Kotlin

nonstd-lite / optional-lite

Star 421

optional lite - A C++17-like optional, a nullable object for C++98, C++11 and later in a single-file header-only library

header-only cpp17 optional no-dependencies cpp98 single-file optional-implementations
  • Updated Nov 28, 2025
  • C++

TeaEntityLab / fpGo

Star 356

Monad, Functional Programming features for Golang

golang monads reactive collection stream functional-programming pattern-matching actor-model pubsub reactive-programming monad functional-reactive-programming curry golang-library optional currying sum-types optional-implementations publisher-subscriber publisher-subscriber-pattern
  • Updated Jul 1, 2026
  • Go

LoopPerfect / neither

Star 258

Either and Maybe monads for better error-handling in C++ ↔️

monads cpp functional-programming header-only optional maybe either buckaroo
  • Updated Oct 31, 2019
  • C++

markphelps / optional

Sponsor
Star 222

Optional is a library of optional Go types

go golang go-generate optional
  • Updated Jul 8, 2023
  • Go

moznion / go-optional

Star 220

A library that provides Go Generics friendly "optional" features.

go golang generics optional optional-typing
  • Updated Aug 19, 2026
  • Go

reljicd / spring-boot-blog

Star 197

Simple blog web app made using Spring Boot + Thymeleaf

blog java shell bash docker spring spring-boot thymeleaf spring-data-rest spring-security java8 shell-script springboot optional spring-mvc spring-data-jpa h2 bash-script h2-database
  • Updated Aug 1, 2024
  • Java

Respawnsive / Apizr

Sponsor
Star 175

Refit based web api client management, but resilient (retry, connectivity, cache, auth, log, priority, etc...)

dotnet optional akavache mediatr polly refit automapper fusillade httptracer monkeycache
  • Updated Mar 16, 2026
  • C#

vittorioromeo / scelta

Sponsor
Star 162

(experimental) Syntactic sugar for variant and optional types.

lambda cpp boost cpp14 visit recursive cpp17 optional std variant visitation scelta
  • Updated May 11, 2019
  • C++

Sedeniono / tiny-optional

Star 154

Drop-in replacement for std::optional that does not waste memory unnecessarily

c-plus-plus cpp header-only optional c-plus-plus-17 memory-efficiency c-plus-plus-20 cache-friendly
  • Updated Jul 12, 2026
  • C++

OpenAPITools / jackson-databind-nullable

Star 152

JsonNullable wrapper class and Jackson module to support meaningful null values

jackson optional nullable jackson-databind
  • Updated Aug 19, 2026
  • Java

TeaEntityLab / fpRust

Star 125

Monad/MonadIO, Handler, Coroutine/doNotation, Functional Programming features for Rust

rust monads reactive generator functional-programming async handler coroutines actor-model pubsub reactive-programming monad functional-reactive-programming optional rust-library coroutine-library coroutine optional-implementations publisher-subscriber publisher-subscriber-pattern
  • Updated Jul 13, 2026
  • Rust

bromne / typescript-optional

Star 117

Optional (like Java) implementation in TypeScript

typescript java-8 optional
  • Updated Nov 16, 2023
  • TypeScript

jordan-bonecutter / goption

Star 105

Optional values for Go

go golang options optional option
  • Updated Dec 24, 2024
  • Go

php-slang / php-slang

Star 104

The place where PHP meets Functional Programming

php functional-programming parallel-computing fp parallelism immutability monad optional either-monad future-monad immutable-php
  • Updated May 21, 2018
  • PHP

MaT1g3R / option

Star 103

Rust like Option and Result types in Python

typing option-type optional result mypy pep484 result-type
  • Updated Jan 1, 2024
  • Python

bitwizeshift / BackportCpp

Sponsor
Star 94

Library of backported modern C++ types to work with C++11

best-practices c-plus-plus-11 modern-cpp cpp14 stl cpp11 c-plus-plus-14 template-metaprogramming header-only standard-template-library cpp17 optional span standard-library variant no-dependencies any backport cpp20 string-view
  • Updated May 6, 2025
  • C++

Soft / iter

Star 72

iter is a generic iterator library for Go

go golang iteration iterator generics iterators golang-library optional
  • Updated Sep 16, 2023
  • Go

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