Examples¶

Annotated references for the canonical Fourier source files shipped in fourier/examples/.

• Counter — minimal contract with init and a single mutating method. Source: fourier/examples/counter.fou.
• Token (ERC-20-flavored) — balances mapping, transfer with event emission. Source: fourier/examples/token.fou.
• Threshold (M-of-N) — pattern reference for an M-of-N approval contract. Built from the multisig stdlib primitives.
• Guestbook — append-only message log using a storage array.

The first two correspond to working .fou files. The second two are pattern references built from primitives in the language and stdlib; v1 does not ship them as separate .fou files.

Page structure¶

Each page:

1. Shows the full source.
2. Annotates each declaration and function.
3. Notes the resulting selector layout, storage slots, and any subtleties.
4. Lists variants.

For language-feature deep-dives, see the Language reference. The examples here assume familiarity with the Quick reference.