FLIN
The language that replaces 47 technologies
A compiled, full-stack programming language built from scratch in Rust. One syntax for frontend, backend, database, and tooling. 3,200+ tests. 180 embedded UI components. Zero npm dependencies.
Building FLIN
Async and Concurrency in the VM
Async execution and concurrency in FLIN's VM: WebSocket support, concurrent tasks, and event loop design.
The Reactivity Engine: How FLIN Makes Everything Reactive
FLIN's reactivity engine: automatic dependency tracking, SSE-based updates, and incremental DOM rendering.
The First Browser Render: When FLIN Met the DOM
The first time FLIN rendered in the browser: compiling bytecode to HTML, the milestone of Session 26.
Parallel Agents in the FLIN Runtime
FLIN's parallel agent system: concurrent execution, message passing, and the agent-based runtime model.
FLIN's Type System: Inferred, Expressive, Safe
How we designed FLIN's type system to be inferred by default, expressive when needed, and safe at compile time -- without the verbosity tax of traditional typed languages.
Union Types and Type Narrowing
How we implemented union types in FLIN -- the int | text | bool syntax, type narrowing through control flow, and the Rust compiler infrastructure that makes it all work.
Generic Types in FLIN
How we implemented generic types in FLIN -- type parameters, generic functions, generic type aliases, and the lexer trick that distinguishes Option<T> from <div>.
Traits and Interfaces
How we designed FLIN's trait system -- trait declarations, impl blocks, trait bounds on generics, and the Rust implementation that ties polymorphism to type safety.
Pattern Matching: From Switch to Match
How we designed FLIN's pattern matching -- from simple value matching to exhaustive checking on tagged unions, and the Rust implementation that powers it all.
Tagged Unions and Algebraic Data Types
How we brought algebraic data types to FLIN -- generic enums with associated data, Option<T>, Result<T, E>, and the Rust implementation of tagged unions.
Building a Stack-Based Virtual Machine in Rust
How we built FLIN's stack-based virtual machine in Rust: execution loop, value types, and call frames.
FLIN: The Language That Replaces 47 Technologies
One language for frontend, backend, database, and tooling. Built from scratch in Rust with 3,200+ tests. No npm. No Webpack. No framework fatigue.