Urbit Docs
  • What is Urbit?
  • Get on Urbit
  • Build on Urbit
    • Contents
    • Environment Setup
    • Hoon School
      • 1. Hoon Syntax
      • 2. Azimuth (Urbit ID)
      • 3. Gates (Functions)
      • 4. Molds (Types)
      • 5. Cores
      • 6. Trees and Addressing
      • 7. Libraries
      • 8. Testing Code
      • 9. Text Processing I
      • 10. Cores and Doors
      • 11. Data Structures
      • 12. Type Checking
      • 13. Conditional Logic
      • 14. Subject-Oriented Programming
      • 15. Text Processing II
      • 16. Functional Programming
      • 17. Text Processing III
      • 18. Generic and Variant Cores
      • 19. Mathematics
    • App School I
      • 1. Arvo
      • 2. The Agent Core
      • 3. Imports and Aliases
      • 4. Lifecycle
      • 5. Cards
      • 6. Pokes
      • 7. Structures and Marks
      • 8. Subscriptions
      • 9. Vanes
      • 10. Scries
      • 11. Failure
      • 12. Next Steps
      • Appendix: Types
    • App School II (Full-Stack)
      • 1. Types
      • 2. Agent
      • 3. JSON
      • 4. Marks
      • 5. Eyre
      • 6. React app setup
      • 7. React app logic
      • 8. Desk and glob
      • 9. Summary
    • Core Academy
      • 1. Evaluating Nock
      • 2. Building Hoon
      • 3. The Core Stack
      • 4. Arvo I: The Main Sequence
      • 5. Arvo II: The Boot Sequence
      • 6. Vere I: u3 and the Serf
      • 7. Vere II: The Loom
      • 8. Vanes I: Behn, Dill, Kahn, Lick
      • 9. Vanes II: Ames
      • 10. Vanes III: Eyre, Iris
      • 11. Vanes IV: Clay
      • 12. Vanes V: Gall and Userspace
      • 13. Vanes VI: Khan, Lick
      • 14. Vanes VII: Jael, Azimuth
    • Runtime
      • U3
      • Conn.c Guide
      • How to Write a Jet
      • API Overview by Prefix
      • C in Urbit
      • Cryptography
      • Land of Nouns
    • Tools
      • Useful Links
      • JS Libraries
        • HTTP API
      • Docs App
        • File Format
        • Index File
        • Suggested Structure
    • Userspace
      • Command-Line App Tutorial
      • Remote Scry
      • Unit Tests
      • Software Distribution
        • Software Distribution Guide
        • Docket File
        • Glob
      • Examples
        • Building a CLI App
        • Debugging Wrapper
        • Host a Website
        • Serving a JS Game
        • Ship Monitoring
        • Styled Text
  • Urbit ID
    • What is Urbit ID?
    • Azimuth Data Flow
    • Life and Rift
    • Urbit HD Wallet
    • Advanced Azimuth Tools
    • Custom Roller Tutorial
    • Azimuth.eth Reference
    • Ecliptic.eth Reference
    • Layer 2
      • L2 Actions
      • L2 Rollers
      • L2 Roller HTTP RPC-API
      • L2 Transaction Format
  • Urbit OS
    • What is Urbit OS?
    • Base
      • Hood
      • Threads
        • Basics Tutorial
          • Bind
          • Fundamentals
          • Input
          • Output
          • Summary
        • HTTP API Guide
        • Spider API Reference
        • Strandio Reference
        • Examples
          • Child Thread
          • Fetch JSON
          • Gall
            • Poke Thread
            • Start Thread
            • Stop Thread
            • Take Facts
            • Take Result
          • Main-loop
          • Poke Agent
          • Scry
          • Take Fact
    • Kernel
      • Arvo
        • Cryptography
        • Move Trace
        • Scries
        • Subscriptions
      • Ames
        • Ames API Reference
        • Ames Cryptography
        • Ames Data Types
        • Ames Scry Reference
      • Behn
        • Behn API Reference
        • Behn Examples
        • Behn Scry Reference
      • Clay
        • Clay API Reference
        • Clay Architecture
        • Clay Data Types
        • Clay Examples
        • Clay Scry Reference
        • Filesystem Hierarchy
        • Marks
          • Mark Examples
          • Using Marks
          • Writing Marks
        • Using Clay
      • Dill
        • Dill API Reference
        • Dill Data Types
        • Dill Scry Reference
      • Eyre
        • EAuth
        • Eyre Data Types
        • Eyre External API
        • Eyre Internal API
        • Eyre Scry Reference
        • Low-Level Eyre Guide
        • Noun channels
      • Gall
        • Gall API Reference
        • Gall Data Types
        • Gall Scry Reference
      • Iris
        • Iris API Reference
        • Iris Data Types
        • Iris Example
      • Jael
        • Jael API Reference
        • Jael Data Types
        • Jael Examples
        • Jael Scry Reference
      • Khan
        • Khan API Reference
        • Khan Data Types
        • Khan Example
      • Lick
        • Lick API Reference
        • Lick Guide
        • Lick Examples
        • Lick Scry Reference
  • Hoon
    • Why Hoon?
    • Advanced Types
    • Arvo
    • Auras
    • Basic Types
    • Cheat Sheet
    • Cryptography
    • Examples
      • ABC Blocks
      • Competitive Programming
      • Emirp
      • Gleichniszahlenreihe
      • Islands
      • Luhn Number
      • Minimum Path Sum
      • Phone Letters
      • Restore IP
      • Rhonda Numbers
      • Roman Numerals
      • Solitaire Cipher
      • Water Towers
    • Generators
    • Hoon Errors
    • Hoon Style Guide
    • Implementing an Aura
    • Irregular forms
    • JSON
    • Limbs and wings
      • Limbs
      • Wings
    • Mips (Maps of Maps)
    • Parsing Text
    • Runes
      • | bar · Cores
      • $ buc · Structures
      • % cen · Calls
      • : col · Cells
      • . dot · Nock
      • / fas · Imports
      • ^ ket · Casts
      • + lus · Arms
      • ; mic · Make
      • ~ sig · Hints
      • = tis · Subject
      • ? wut · Conditionals
      • ! zap · Wild
      • Constants (Atoms and Strings)
      • --, == · Terminators
    • Sail (HTML)
    • Serialization
    • Sets
    • Standard Library
      • 1a: Basic Arithmetic
      • 1b: Tree Addressing
      • 1c: Molds and Mold-Builders
      • 2a: Unit Logic
      • 2b: List Logic
      • 2c: Bit Arithmetic
      • 2d: Bit Logic
      • 2e: Insecure Hashing
      • 2f: Noun Ordering
      • 2g: Unsigned Powers
      • 2h: Set Logic
      • 2i: Map Logic
      • 2j: Jar and Jug Logic
      • 2k: Queue Logic
      • 2l: Container from Container
      • 2m: Container from Noun
      • 2n: Functional Hacks
      • 2o: Normalizing Containers
      • 2p: Serialization
      • 2q: Molds and Mold-Builders
      • 3a: Modular and Signed Ints
      • 3b: Floating Point
      • 3c: Urbit Time
      • 3d: SHA Hash Family
      • 3e: AES encryption (Removed)
      • 3f: Scrambling
      • 3g: Molds and Mold-Builders
      • 4a: Exotic Bases
      • 4b: Text Processing
      • 4c: Tank Printer
      • 4d: Parsing (Tracing)
      • 4e: Parsing (Combinators)
      • 4f: Parsing (Rule-Builders)
      • 4g: Parsing (Outside Caller)
      • 4h: Parsing (ASCII Glyphs)
      • 4i: Parsing (Useful Idioms)
      • 4j: Parsing (Bases and Base Digits)
      • 4k: Atom Printing
      • 4l: Atom Parsing
      • 4m: Formatting Functions
      • 4n: Virtualization
      • 4o: Molds
      • 5a: Compiler Utilities
      • 5b: Macro Expansion
      • 5c: Compiler Backend & Prettyprinter
      • 5d: Parser
      • 5e: Molds and mold builders
      • 5f: Profiling support
    • Strings
    • The Engine Pattern
    • Udon (Markdown-esque)
    • Vases
    • Zuse
      • 2d(1-5): To JSON, Wains
      • 2d(6): From JSON
      • 2d(7): From JSON (unit)
      • 2e(2-3): Print & Parse JSON
      • 2m: Ordered Maps
  • Nock
    • What is Nock?
    • Decrement
    • Definition
    • Fast Hints and Jets
    • Implementations
    • Specification
  • User Manual
    • Contents
    • Running Urbit
      • Cloud Hosting
      • Home Servers
      • Runtime Reference
      • Self-hosting S3 Storage with MinIO
    • Urbit ID
      • Bridge Troubleshooting
      • Creating an Invite Pool
      • Get an Urbit ID
      • Guide to Factory Resets
      • HD Wallet (Master Ticket)
      • Layer 2 for planets
      • Layer 2 for stars
      • Proxies
      • Using Bridge
    • Urbit OS
      • Basics
      • Configuring S3 Storage
      • Dojo Tools
      • Filesystem
      • Shell
      • Ship Troubleshooting
      • Star and Galaxy Operations
      • Updates
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  1. Hoon

Cheat Sheet

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