mo - Introduce Monads and Functional Programming Abstractions to Go Applications

Introduction to mo - Monads

Overview

samber/mo is a remarkable library designed to integrate monads and popular functional programming (FP) abstractions into Go projects. With the introduction of Go 1.18+ Generics, this library provides a powerful toolkit inspired by programming paradigms found in languages like Scala, Rust, and FP-TS.

Inspirations and Related Projects

The project draws inspiration from functional programming concepts and is part of a suite of tools developed by samber. Alongside samber/mo, there are other notable projects like samber/lo, a LoDash-style library for Go, and samber/do, a dependency injection toolkit, both leveraging Go 1.18+ Generics.

Naming

The name "mo" cleverly associates with "Monad Go," offering a concise and memorable title for this utility library, distinct in the Go ecosystem.

Features and Functionalities

The samber/mo library supports a variety of data types common in functional programming:

Option[T] (Maybe): Facilitates optional values handling.
Result[T]: Provides structures for representing success or failure.
Either[A, B]: Represents a value of two possible types.
EitherX[T1, ..., TX]: Handles values with up to 5 possible types.
Future[T]: Manages values that may be available in the future.
IO[T] and IOEither[T]: Handles synchronous computations with/without failure.
Task[T] and TaskEither[T]: Manages asynchronous computations with/without failure.
State[S, A]: State management abstraction.

Installation and Versioning

To incorporate samber/mo into a project, installation is straightforward:

go get github.com/samber/mo@v1

This library adheres strictly to SemVer (Semantic Versioning), ensuring no breaking changes until the release of version 2.0.0. It only depends on the Go standard library, making it lightweight and efficient.

Quick Start Guide

To use samber/mo, import it into your Go project:

import (
    "github.com/samber/mo"
)

Here's a simple example of how to work with Option[T]:

option1 := mo.Some(42)
// Some(42)

result := option1.
    FlatMap(func (value int) Option[int] {
        return Some(value*2)
    }).
    OrElse(1234)
// 21

The library provides extensive documentation and usage examples, accessible through the GoDoc platform, facilitating ease of adoption for developers new to these concepts.

Tips for Lazy Developers

Developers can optionally import the entire library namespace for convenience:

import (
    . "github.com/samber/mo"
)

Documentation and Examples

For further exploration, detailed documentation is available on GoDoc:

GoDoc for samber/mo

Within this documentation, developers will find comprehensive guides and examples illustrating the use of each data structure and method provided by the library.

Conclusion

samber/mo introduces the power of functional programming to the Go language, enabling developers to utilize FP practices efficiently within their applications. Its range of tools and simplicity of integration make it a valuable resource for any Go developer aiming to embrace functional programming paradigms.