Online Playground

Try Sage instantly in your browser — no installation required.

sagelang.github.io/sage-playground

Features

• Editable code — write any Sage code in the browser
• Live output — see print() output and yield values immediately
• Syntax highlighting — keywords, types, strings, numbers, builtins, and comments
• Example programs — Hello World, Counter Loop, String Operations, Fibonacci
• Keyboard shortcuts — Ctrl/Cmd+Enter to run, Tab to indent

How It Works

The playground uses a tree-walking interpreter (sage-playground-engine) compiled to WebAssembly. It shares the same parser as the full Sage compiler but interprets the AST directly instead of generating Rust code.

The interpreter supports:

• Variables, assignments, and scoping
• Functions (user-defined and standard library)
• Control flow: if/else, while, for, loop, break, return
• Records, enums, tuples, and pattern matching
• String operations and interpolation
• print(), trace(), and yield()
• Infinite loop protection (1M step limit)

What’s Not Supported

The playground interpreter does not support features that require external services:

• divine / infer (LLM calls)
• Tool calls (Http, Database, Fs, Shell)
• Agent spawning (summon, await)
• Supervisors and protocols
• Persistence (@persistent)

These features work in the full compiled Sage — the playground focuses on exploring the core language.