funfix

funfix / continuations4s

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Delimited continuations, for Scala 3, supported across JVM, JS and Native.

continuations4s.funfix.org concurrency jvm scala scala-native scalajs
18
1
100% credibility
Found Feb 25, 2026 at 13 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
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AI Summary

Continuations4s provides a cross-platform library for Scala 3 that enables writing asynchronous code in a direct, synchronous style using delimited continuations on JVM, Scala.js, and Scala Native.

How It Works

1
🔍 Discover the helper

You hear about a handy tool that makes handling background tasks in programs feel simple and natural, working everywhere from computers to web.

2
📖 Read the guide

You look at the clear instructions and a ready example that shows waiting for results without hassle.

3
➕ Add it easily

You include this tool in your project following the quick one-line setup.

4
✍️ Write smooth code

You craft your program using natural pauses for tasks, like awaiting a friend's reply in conversation.

5
🧪 Test it out

You run your creation on desktop, web browsers, or fast native setups to see it shine.

🎉 Works perfectly everywhere

Your program handles waits gracefully across all places, saving you time and headaches.

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Star Growth

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AI-Generated Review

What is continuations4s?

Continuations4s delivers delimited continuations for Scala 3, supported across JVM, JS via WASM, and Native—think scheme delimited continuations or Haskell-style, but for cross-platform Scala code. It enables direct-style programming, where async ops like awaiting Futures look synchronous without monads or callbacks. Add it as a library dependency and run examples via Scala CLI on any target.

Why is it gaining traction?

Unlike platform-locked delimited continuations in Java, JavaScript, OCaml, or Rust, this works everywhere in Scala, dodging async boilerplate while staying low-level. It beats algebraic effects for suspension-heavy libs by capturing continuations precisely, ideal for delimited continuations vs algebraic effects debates. Extracted from EPFL's gears, it hooks Scala devs chasing portable, "direct style" APIs.

Who should use this?

Scala library maintainers building async tools that span JVM backends, web via JS/WASM, and embedded Native apps. Cross-platform teams tired of rewriting Futures or Promises per target, or OS devs exploring delimited continuations in operating systems. Early adopters experimenting with continuations4s on GitHub.

Verdict

At 11 stars and 1.0% credibility, continuations4s is raw and unproven—great README with CLI-run examples, but no tests or broad adoption yet. Grab it for delimited continuations Scala prototypes if multi-platform direct style excites you; skip for production until it matures.

(178 words)

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