Examples¶

Walkthroughs of 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 sketch 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 are working .fou files; the second two are pattern walkthroughs built from primitives that exist in the language and stdlib (they don't ship as separate .fou files in v1).

What you'll see¶

Each walkthrough:

1. Shows the full source.
2. Walks line-by-line through each declaration and function.
3. Notes the resulting selector layout, storage slots, and any subtleties.
4. Suggests next variants to try.

For language-feature deep-dives — what each construct means — go to the Language reference. The examples here assume you've at least skimmed the Quick reference.