samber/mo

Health v2 · maintenance only

Adoption not part of the score

3403 stars · 118 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

samber/mo is a Go library providing monads and functional programming abstractions such as Option, Result, Either, Future, IO, Task, and State, built on Go 1.18+ generics. It enables type-safe, composable error handling and functional pipelines with no dependencies beyond the Go standard library.

Use cases

• handle optional values without nil checks in Go
• model errors as values with Result types in Go
• use Either types for error handling in Go
• compose functional pipelines with map and flatMap in Go
• represent async computations with Future and Task in Go
• avoid nil pointer errors using Option/Maybe types
• write functional-style code in Go with generics

When to choose

• you want Rust/Scala-style Option and Result semantics in Go
• your team prefers explicit, type-safe error handling over error tuples
• you need composable transformations for optional or fallible values
• you want a dependency-free, SemVer-stable FP library

When to avoid

• your codebase follows idiomatic Go error-return conventions and the team is unfamiliar with FP
• you need full monad transformer stacks or advanced FP features not provided here
• you are on Go versions older than 1.18 without generics support

Facets

library · maturity stable

error-handling concurrency developer-tools developer-tools programming-languages go cross-platform monads functional-programming generics option-type result-type either task future state-monad algorithms

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