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TomerAberbach/lfi

🦥 A lazy functional iteration library supporting sync, async, and concurrent iteration.

TypeScript

350

286 commits

updated Dec 16, 2025

lfi.dev

See the code

See what people are saying

SourceMessageScoreDate

Some info on this page: https://lfi.dev/docs/concepts/concurrent-iterable Recommend reading it all, but this part is probably most useful: https://lfi.dev/docs/concepts/concurrent-iterable#how-does-i...

on Show HN: Lfi – a lazy functional sync, async, and concurrent iteration library

0

Dec 13, 2024

> I believe what you are calling a "concurrent" iteration is one of the use cases for Observables, so would be on the RxJS side (the "parent" project). Ah, got it. I don't think I quite understood the relationship between this project and RxJS. I did know about RxJS's observables, yes. I do sort of…

on Show HN: Lfi – a lazy functional sync, async, and concurrent iteration library

0

Dec 12, 2024

I was not aware of it! As far as I can tell, it has some similar ideas (and seems pretty nice!), but I noticed the following differences: - I don't _think_ it supports "concurrent" iteration [1] - It doesn't have a "reducer" concept with composition and what not [2] - It doesn't have a concept of…

on Show HN: Lfi – a lazy functional sync, async, and concurrent iteration library

0

Dec 12, 2024

Show HN: Lfi – a lazy functional sync, async, and concurrent iteration library

98

Dec 11, 2024

README

Sloth juggling office supplies

lfi

A lazy functional iteration library supporting sync, async, and concurrent iteration.

Features

  • Lazy: delays applying operations until their results are needed
  • Functional: provides highly composable functions
  • Iteration: supports sync iterables, async iterables, and unique concurrent iterables
  • Async & Concurrent: apply async operations sequentially over async iterables or concurrently over concurrent iterables
  • Tree Shakeable: only bundle the code you actually use!
  • Adorable Logo: designed by Jill Marbach!

Getting started

Check out the documentation at lfi.dev!

Contributing

Stars are always welcome!

For bugs and feature requests, please create an issue.

License

MIT © Tomer Aberbach
Apache 2.0 © Google

async
concurrent
functional-programming
generator
iterable
iterator
javascript
lazy
npm-module
npm-package
promise
sync

Project health

Overall

3.4/10

Maintained

0/10

Code review

0/10
OpenSSF Scorecard

npm

lfi

Latest release

4.1.2 · Dec 16, 2025

Releases this year

1

Significant stargazers

Andrey Okonetchnikov

1,090 followers · starred Nov 2021

Pascal Birchler

662 followers · starred Dec 2021

Anton Korzunov

747 followers · starred Nov 2021

Alex Reardon

1,186 followers · starred Nov 2021

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TomerAberbach/lfi

🦥 A lazy functional iteration library supporting sync, async, and concurrent iteration.

TypeScript

350

286 commits

updated Dec 16, 2025

lfi.dev

See the code

See what people are saying

SourceMessageScoreDate

Some info on this page: https://lfi.dev/docs/concepts/concurrent-iterable Recommend reading it all, but this part is probably most useful: https://lfi.dev/docs/concepts/concurrent-iterable#how-does-i...

on Show HN: Lfi – a lazy functional sync, async, and concurrent iteration library

0

Dec 13, 2024

> I believe what you are calling a "concurrent" iteration is one of the use cases for Observables, so would be on the RxJS side (the "parent" project). Ah, got it. I don't think I quite understood the relationship between this project and RxJS. I did know about RxJS's observables, yes. I do sort of…

on Show HN: Lfi – a lazy functional sync, async, and concurrent iteration library

0

Dec 12, 2024

I was not aware of it! As far as I can tell, it has some similar ideas (and seems pretty nice!), but I noticed the following differences: - I don't _think_ it supports "concurrent" iteration [1] - It doesn't have a "reducer" concept with composition and what not [2] - It doesn't have a concept of…

on Show HN: Lfi – a lazy functional sync, async, and concurrent iteration library

0

Dec 12, 2024

Show HN: Lfi – a lazy functional sync, async, and concurrent iteration library

98

Dec 11, 2024

README

Sloth juggling office supplies

lfi

A lazy functional iteration library supporting sync, async, and concurrent iteration.

Features

  • Lazy: delays applying operations until their results are needed
  • Functional: provides highly composable functions
  • Iteration: supports sync iterables, async iterables, and unique concurrent iterables
  • Async & Concurrent: apply async operations sequentially over async iterables or concurrently over concurrent iterables
  • Tree Shakeable: only bundle the code you actually use!
  • Adorable Logo: designed by Jill Marbach!

Getting started

Check out the documentation at lfi.dev!

Contributing

Stars are always welcome!

For bugs and feature requests, please create an issue.

License

MIT © Tomer Aberbach
Apache 2.0 © Google

async
concurrent
functional-programming
generator
iterable
iterator
javascript
lazy
npm-module
npm-package
promise
sync

Project health

Overall

3.4/10

Maintained

0/10

Code review

0/10
OpenSSF Scorecard

npm

lfi

Latest release

4.1.2 · Dec 16, 2025

Releases this year

1

Significant stargazers

Andrey Okonetchnikov

1,090 followers · starred Nov 2021

Pascal Birchler

662 followers · starred Dec 2021

Anton Korzunov

747 followers · starred Nov 2021

Alex Reardon

1,186 followers · starred Nov 2021

Similar repos

TomerAberbach/grfn

🦅 A tiny (~315B) utility that executes a dependency graph of async functions as concurrently as…

631

same org

marpple/FxTS

A functional programming library for TypeScript/JavaScript

1,169

leebyron/iterall

🌻 Minimal zero-dependency utilities for using Iterables in all JavaScript environments.

813

ReactiveX/IxJS

The Interactive Extensions for JavaScript

1,411

achingbrain/it

A collection of utilities for making working with iterables more bearable

284

stoeffel/awesome-fp-js

😎 A curated list of awesome functional programming stuff in js

6,038

fluture-js/Fluture

🦋 Fantasy Land compliant (monadic) alternative to Promises

2,491

tc39/proposal-async-iteration

Asynchronous iteration for JavaScript

856