Life & fun · alternatives · 2026
24 alternatives to Lfi – a lazy functional sync, async, and concurrent iteration library
Hey HN! Roughly 4 years ago I started building a lazy functional iteration library for JS/TS. I had a few goals for the library: - Supporting sync, sequential async, and concurrent async iteration - Limiting it to a small number of orthogonal concepts that compose beautifully to solve problems - Making it fully tree-shakeable I built it for myself and have (mostly) been its only user as I refined it. I've used it in lots of personal projects and really enjoyed it. I recently decided it would be nice to spread that enjoyment so I created a documentation website complete with a playground…
Lfi is a JavaScript and TypeScript library for lazy functional iteration that handles synchronous, sequential asynchronous, and concurrent asynchronous operations. It emphasizes composable, orthogonal concepts designed… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Lfi – a lazy functional sync, async, and concurrent iteration library launched in 2024; newer entries below may have overtaken it.
- 1
An experimental language which adds functional programming features to Go. - albrow/fo
2018 · github.com · its alternatives →
- 2
Hey HN, this is Will and David from Fortress (https://news.ycombinator.com/item?id=41426998). We use a lot of async Rust internally, and created this library out of a need for an async-aware concurrent hashmap since there weren’t many available in the Rust ecosystem. Whirlwind is a sharded HashMap with a fully asynchronous API. Just as dashmap is a replacement for std::sync::RwLock, whirlwind aims to be a replacement for tokio::sync::RwLock. It has a similar design and performance characteristics to dashmap, but seems to perform better in read-heavy workloads with tokio's…
2024 · github.com · its alternatives →
- 3
Moved to Forgejo! Contribute to krig/LISP development by creating an account on GitHub.
2018 · github.com · its alternatives →
- 4
Implementation of the standard is still not complete, but breakpoints and stepping work quite well! It also has some support for watchpoints, that no implementation has. Now it ships with ASDF and is capable of loading systems! Let me know if you like it. Support on Patreon or Liberapay is much appreciated
2025 · savannah.nongnu.org · its alternatives →
- 5
We'd love to share our work with you: Restate, a system for workflows-as-code (durable execution). With SDKs in JS/Java/Kotlin and a lightweight runtime built in Rust/Tokio. https://github.com/restatedev/ https://restate.dev/ It is free and open, SDKs are MIT-licensed, runtime permissive BSL (basically just the minimal Amazon defense). We worked on that for a bit over a year. A few points I think are worth mentioning: - Restate's runtime is a single binary, self-contained, no dependencies aside from a durable disk. It contains basically a…
2024 · restate.dev · its alternatives →
- 6
DataMorf▲97Simplify real-time data manipulation and integration
2023 · datamorf.io · its alternatives →
- 7
utility library for async iterable iterators. Contribute to crcn/mesh.js development by creating an account on GitHub.
2015 · github.com · its alternatives →
- 8
Hey HN, I’m sharing ts-chan, an NPM package providing Go-like concurrency primitives, including channels and select statements, for TypeScript and JavaScript, supporting Node.js, Deno, Bun, and browsers. This is something I've built to make implementing Go-style "control loops" feasible in JavaScript, but there are many possible applications. Highlights: - Features a FIFO processing Chan class and versatile Select class for concurrency control. - Supports buffered channel and channel close semantics very close to Go's. - TypeScript-first implementation. - Defines a simple "channel protocol"…
2023 · github.com · its alternatives →
- 9
We've been building Crust (https://crustjs.com/), a TypeScript-first, Bun-native CLI framework with zero dependencies. It's been powering our core product internally for a while, and we're now open-sourcing it. The problem we kept running into: existing CLI frameworks in the JS ecosystem are either minimal arg parsers where you wire everything yourself, or heavyweight frameworks with large dependency trees and Node-era assumptions. We wanted something in between. What Crust does differently: - Full type inference from definitions — args and flags are inferred automatically. No…
Mar 2026 · github.com · its alternatives →
- 10
A tiny (~1kB minzipped) and extremely fast library for creating reactive observables via functions. - maverick-js/signals
2022 · github.com · its alternatives →
- 11
A Go library that implements Consistent Hashing and Consistent Hashing With Bounded Loads. - lafikl/consistent
2017 · github.com · its alternatives →
- 12
We're excited to announce Lowdefy V4, a full-stack web framework built on top of Next.js that simplifies building web applications, internal tools, admin panels, BI dashboards, and CRUD apps using YAML or JSON configuration files. New in V4: Next.js: Lowdefy now runs on top of the Next.js framework. All of Auth.js: App auth is now handled by Auth.js supported providers, adapters and callbacks and events, easy to configure, but all of which can be customized. Plugin extensibility: Apps can now be extended with any npm or pnpm workspace plugins. Our story: We have developed a simple…
2021 · lowdefy.com · its alternatives →
- 13
C++14: bringing in those expressions that you wish you had, Lazily evaluated, compossible generators, maps, filters, ranges and more... - GitHub - SaadAttieh/lazyCode: C++14: bringing in those expressions that you wish you had, Lazily evaluated, compossible generators, maps, filters, ranges and more
2018 · github.com · its alternatives →
- 14
I kept rewriting the same array.slice(i, i + n) logic in every project. Eventually, I decided to stop and just make a utility. Chonkify is a small (~870B), zero-dependency JS/TS library for chunking any kind of data: - Works with Array, String, Buffer, Set, Map, Array-like, TypedArray - Handles AsyncIterable (great for batching streams) - Unicode-safe (correctly handles grapheme clusters, emoji, etc.) - ESM-first, TypeScript-ready I mostly made it for myself, but figured others might find it useful too. Would love feedback!
2025 · github.com · its alternatives →
- 15
Composable async primitives with cancelation, control over scheduling, and coroutines. Superior replacement for JS Promises. - mitranim/posterus
2017 · github.com · its alternatives →
- 16WJ
2014 · fitzgen.github.io · its alternatives →
- 17
Lisp-like-R: A clojure inspired lisp that compiles to R in R - dirkschumacher/llr
2021 · github.com · its alternatives →
- 18
high order functions for JavaScript async/sync iterators - GitHub - MiguelCastillo/coseq: high order functions for JavaScript async/sync iterators
2017 · github.com · its alternatives →
- 19PA
Hi HN, I’m experimenting with a small Python library called PicoFlow for building LLM agent workflows using a lightweight DSL. I’ve been using tools like LangChain and CrewAI, and wanted to explore a simpler, more function-oriented way to compose agent logic, closer to normal Python control flow and async functions. PicoFlow focuses on: - composing async functions with operators - minimal core and few concepts to learn - explicit data flow through a shared context - easy embedding into existing services A typical flow looks like: flow = plan >> retrieve >> answer await flow(ctx) Patterns…
Jan 2026 · its alternatives →
- 20
I started writing this book 10 years ago in JavaScript, got through a few chapters (asymptotic notation, basic techniques, start of sorting), and then abandoned it. Recently I picked it back up, converted everything to TypeScript, and used AI (Zenflow [1] + Claude Opus 4.6) to complete the remaining chapters. I provided the structure, direction, and initial chapters; the AI generated the bulk of the remaining content under a spec-driven workflow. The book covers roughly a first 1-2 year CS curriculum: sorting, dynamic programming, graph algorithms, trees, heaps, hash tables, and more. All…
Mar 2026 · amoilanen.github.io · its alternatives →
- 21CP
2014 · vickychijwani.github.io · its alternatives →
- 22
[Satire]🔥 JS utility library to bring classic callback style programming to synchronous code — ES6? More like ES Sucks. - scf4/callbaxx
2018 · github.com · its alternatives →
- 23
Initially I started building this for my own projects. The main goal was to define a unified "blueprint" allowing me to develop multi-platform apps using the same code, without code generation. I wanted to be able to develop the same functionality on web, desktop, cli, server, mobile, whatever... I've been able to achieve this by relying on TypeScript, a 4-layer architecture (UseCase => App => Product => Target) and dependency injection. This mechanism allows me to use whatever tech stack I want, provided the good adapters are developed. For instance, I have pre-built ones : node express…
2025 · github.com · its alternatives →
- 24
2012 · github.com · its alternatives →
Also compare
- Fo: An experimental language which adds generics on top of Go alternatives
- Whirlwind – Async concurrent hashmap for Rust alternatives
- Lisp with copying GC in 537 lines of C (plus Lisp 1.5 on top) alternatives
- A Common Lisp implementation in development, supports ASDF alternatives
- Restate – Low-latency durable workflows for JavaScript/Java, in Rust alternatives
- DataMorf alternatives
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →