Fuzion • Fuzion Design

Fuzion Design

This is a collection of pages on design aspects of the Fuzion language. Some of these ideas are implemented in the current Fuzion language, some have been changed or abandoned, some are ideas for future improvements.

General

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Fuzion Name Logo Identifiers

Syntax

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Fuzion Declaration Syntax Fuzion Keywords Semicolons Parentheses Calls Blocks And Indentation Syntax sugar

Language

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Fuzion Features Feature Kinds Visibility Defining global data Effects Automatic Monadic Lifting Effects to Control Code Generation

Types

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Fuzion Basic Types Fuzion Choice Type Fuzion Tuples Static vs. Dynamic Typing Casts: Dynamic / Ref Types Casts: Value / Numeric Types this.type Type Instances Type Syntax Sugar

Inheritance

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Inheritance Overloading Equality Fixed Features Covariance and Contravariance

Arrays

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Strings Array Constants or Initialization Compound Constants or Instance Initialization

Statements

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Conditional Statements Loops Assignment Notation Destructuring

Expressions

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Constants Chained Boolean Operators Postfix/Prefix Calls Operator Calls Matches in Expressions

Functions

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Currying and Partial Application Syntax Sugar for Lambdas Lazy Evaluation of Arguments Variadic Functions

Correctness

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Fuzion Contracts

Concurrency

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Concurrency Coroutines Light-Weight Threading / Continuations / Async-Await

Tools

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Fuzion Toolchain Design File Names File Formats Fuzion Optimizer Vectorization / SIMD support Fuzion Toolchain Modules

Standard Library

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Standard Library Design Standard Library Naming Base Library Restructuring I/O

Backends

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JVM Backend C Runtime

last changed: 2026-10-07