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Typhon

tyc cheatsheet

tyc cheatsheet

Prints the 30-second Typhon cheat sheet to stdout — every keyword and pattern you need to write or read a .ty file, on one screen. Source lives at docs/cheatsheet.md and is embedded into the tyc binary so it works offline.

Examples

Terminal window
tyc cheatsheet                    # straight to stdout
tyc cheatsheet | less             # paginate it
tyc cheatsheet > cheatsheet.txt   # save it locally

What it covers

  • Bindings — let / mut, the function-body rule, module-level default to let.
  • Annotations — Rule 1, T? for T | None, explicit -> None.
  • Classes — class (dataclass), class frozen (immutable), plain class (no decorator), class! (raw with synthesised __init__), model (Pydantic).
  • Methods in impl blocks — Rule 4.
  • Sealed unions + exhaustive match — declaration and pattern arms.
  • Result[T, E] + ? — Ok/Err, error propagation, with-chains.
  • Checked boundary cast — as!, e.g. let d = resp.json() as! dict[str, int] — sound, runtime-checked one-liner at an untyped boundary.
  • Concurrency — gather:, go, lazy import.
  • Comptime — comptime let, env(), build-time evaluation.
  • CLI — every common tyc subcommand with a one-line purpose.

The full reference lives across Language Tour and Language Reference; the cheat sheet is the rapid-lookup view.

When to reach for it

  • Quick keyword refresh during code review without context-switching to a browser.
  • Pair-programming or workshop scenarios where copy-pasting the syntax saves time.
  • Generating documentation snippets that need the canonical pattern shapes.

Flags

tyc cheatsheet takes no arguments today. The content matches docs/cheatsheet.md byte-for-byte.

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