Fuyu is a general-purpose concurrent, effect-oriented, functional programming language. Write programs in a declarative style using algebraic effects, first-class concurrency, type inference, pattern matching, static typing, traits, and higher-order functions.
Algebraic effects
Fuyu introduces algebraic effects as a future‑ready mechanism for handling side‑effects. Use resumable, composable effects that can be integrated cleanly with pure code.
Scalable concurrency
Compile to native code and run on Fuyu's own lightweight runtime, which can spawn hundreds of thousands of concurrent tasks. Concurrency is highly scalable, letting you tackle massive workloads.
Static typing
Every expression's type is verified at compile time. Inconsistent types cause the compiler to reject the program, eliminating an entire class of runtime errors before the code ever runs.
Type inference
Write concise code without repetitive annotations. While function signatures stay explicit, the compiler automatically infers the types of all other expressions, preserving safety with minimal visual noise.
Declarative style
Use pattern matching and algebraic effects to describe what to do, not how to do it. Let the compiler help you by checking exhaustiveness, managing side-effects, and generating optimized code.
Immutability
Immutability ensures that values never change after creation, giving you referential transparency and making programs easier to reason about, test, and refactor.