fp-filters (JavaScript / TypeScript)

What it does

A curated list of ready-to-use (functional programming) array filter functions in JavaScript and TypeScript (TS / ESM / CJS). fp-filters allows you to stop rewriting the same code over and over again and greatly improves readability. So that you will probably never write another filter function 🚀! fp-filters functions are designed API-first and leveraging high-order predicates are super easy to use and to combine.

• FF
  Fp-filters – A curated collection of TS/JS array filter functions2025 · npmjs.com · ▲11

  Hello HN, I wanted to share a library I've been working on called: fp-filters - A curated collection of 130+ common-use filter functions that are written (and can be used) in a functional programming style. Why I built this: I have noticed in several codebases the tendency to keep writing the same or similar filter functions over and over again. Often inlined, taxing readability. And realized that most of them do pretty much the same N things. Therefore they could be isolated, curated, and maintained separately. fp-filters provides 130+ composable, point-free filtering functions that make…

• FA
  FilterQL – A tiny query language for filtering structured data2025 · github.com · ▲77

  Hey all, I just released v2.0.0 of FilterQL, a query language and TypeScript library. This version adds support for Operations, which allow you to transform the data after filtering. If you think this would be useful in a project you're working on, give it a try and let me know what you think!

• FP
  FP-pack – Functional pipelines in TypeScript without monadsJan 2026 · github.com · ▲14

  Hi HN, I built fp-pack, a small TypeScript functional utility library focused on pipe-first composition. The goal is to keep pipelines simple and readable, while still supporting early exits and side effects — without introducing monads like Option or Either. Most code uses plain pipe/pipeAsync. For the few cases that need early termination, fp-pack provides a SideEffect-based pipeline that short-circuits safely. I also wrote an “AI agent skills” document to help LLMs generate consistent fp-pack-style code. Feedback, criticism, or questions are very welcome.

• JJ
  JAQT – JavaScript Queries and Transformations2024 · github.com · ▲100

  Hi all, I've made a javascript library to simplify searching/sorting/filtering in arrays of objects. Its inspired by both GraphQL and SQL, but implemented using javascript Proxies. Instead of creating a new language, its all just javascript. I've made it as part of an experimental database, which uses javascript as the query engine. The normal javascript map/reduce/sort functions are quite difficult to master for junior developers. JAQT is easier to explain, and can still be used in combination with any existing array functions. Please let me know what you think of the…

• RA
  Remult – a CRUD framework for full-stack TypeScript2022 · github.com · ▲130
• TF
  Typed-FFmpeg 3.0–Typed Interface to FFmpeg and Visual Filter Editor2025 · github.com · ▲342

  Hi HN, I built typed-ffmpeg, a Python package that lets you build FFmpeg filter graphs with full type safety, autocomplete, and validation. It’s inspired by ffmpeg-python, but addresses some long-standing issues like lack of IDE support and fragile CLI strings. What’s New in v3.0: • Source filter support (e.g. color, testsrc, etc.) • Input stream selection (e.g. [0:a], [1:v]) • A new interactive playground where you can: • Build filter graphs visually • Generate both FFmpeg CLI and typed Python code • Paste existing FFmpeg commands and reverse-parse them into graphs Playground link:…

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