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fsprojects/FSharpPlus

F#+ is a functional programming library for F# that provides a comprehensive set of abstractions, data structures, and utilities for functional programming. It supports monads, applicatives, functors, and other algebraic structures, along with type-level programming for compile-time safety. The system also includes documentation tools, test suites, and performance benchmarks to ensure robustness and correctness.

55.6

Adequate · 20 July 2026

20k

lines of production code

F#

primary language

3

bus factor · 76 authors in all

2

measurements over time

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How it got here

2012–2017 · functional abstractions and modernization

This period focused on establishing the project's foundational structure and documentation while modernizing the codebase to target .NET 8 and F# 8. The work introduced new computation expression builders and utilities for functional programming abstractions, supported by comprehensive test coverage and detailed documentation for the library's core features.

5 changes

2019–2022 · Functional programming abstractions and type-level programming

This period focused on expanding the library's functional programming capabilities by introducing new type classes, data structures, and monad transformers. The work also established a robust testing and documentation infrastructure, including comprehensive test suites, benchmarking, and visual diagrams for functional abstractions. Additionally, the introduction of type-level programming support for vectors and matrices marked a significant addition to the library's type system.

12 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 20 July 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit 44ebc378fa — the exact code this score is about.
  • Scored under rubric rubric-2026.08.17. Score the same commit under that rubric and you get the same number.
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