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Overview

Jac Language Reference

Section titled “Jac Language Reference”

The AI-Native Full-Stack Programming Language

One Language for Backend, Frontend, and AI

How to Use This Reference

Section titled “How to Use This Reference”

This is a comprehensive reference for the Jac programming language. Navigate using the sidebar or use browser search (Ctrl+F / Cmd+F) within each page.

Conventions:

  • monospace — Keywords, types, operators, and code
  • Bold — Key terms and concepts
  • Code blocks are verified, executable examples
  • Sections marked (OSP) are Object-Spatial Programming features

Reference Sections

Section titled “Reference Sections”

Part I: Foundation

Section titled “Part I: Foundation”

Core language concepts and syntax basics.

  • Introduction
  • Getting Started
  • Language Basics
  • Types and Values
  • Variables and Scope
  • Operators
  • Control Flow

Part II: Functions and Objects

Section titled “Part II: Functions and Objects”

Functions, classes, and object-oriented programming.

  • Functions and Abilities
  • Object-Oriented Programming
  • Implementations and Forward Declarations

Part III: Object-Spatial Programming

Section titled “Part III: Object-Spatial Programming”

Jac’s unique graph-based programming paradigm.

  • Introduction to OSP
  • Nodes
  • Edges
  • Walkers
  • Graph Construction
  • Graph Traversal
  • Data Spatial Queries
  • Typed Context Blocks

Part IV: Full-Stack Development

Section titled “Part IV: Full-Stack Development”

Building complete applications with Jac.

  • Module System
  • Server-Side Development
  • Client-Side Development (JSX)
  • Server-Client Communication
  • Authentication & Users
  • Memory & Persistence
  • Development Tools

Part V: AI Integration

Section titled “Part V: AI Integration”

LLM integration and meaning-typed programming.

  • Meaning Typed Programming
  • Semantic Strings
  • The by Operator and LLM Delegation
  • Agentic AI Patterns

Part VI: Concurrency

Section titled “Part VI: Concurrency”

Async programming and parallel execution.

  • Async/Await
  • Concurrent Expressions

Part VII: Advanced Features

Section titled “Part VII: Advanced Features”

Error handling, testing, and advanced operators.

  • Error Handling
  • Testing
  • Filter and Assign Comprehensions
  • Pipe Operators

Part VIII: Ecosystem

Section titled “Part VIII: Ecosystem”

Tools, plugins, and interoperability.

  • CLI Reference
  • Plugin System
  • Project Configuration
  • Python Interoperability
  • JavaScript/npm Interoperability
  • Python Integration - 5 adoption patterns, transpilation details

Part IX: Deployment and Scaling

Section titled “Part IX: Deployment and Scaling”

Production deployment with jac-scale.

  • jac-scale Plugin
  • Kubernetes Deployment
  • Production Architecture
  • Library Mode - Pure Python with Jac runtime

Appendices

Section titled “Appendices”

Quick references and migration guides.

  • Complete Keyword Reference
  • Operator Quick Reference
  • Grammar Summary
  • Common Gotchas
  • Migration from Python
  • LLM Provider Reference

Quick Reference

Section titled “Quick Reference”

Focused reference pages for common patterns:

Section titled “Related Resources”

Tutorials

Section titled “Tutorials”

Step-by-step guides for learning Jac:

Plugin References

Section titled “Plugin References”

Detailed API documentation for plugins:

Other References

Section titled “Other References”