Select a file to view its exact on-chain source. Sorted README → gnomod → sources → tests.
Render(path string) string
Signatures reconstructed verbatim from vm/qfuncs — interface params keep their inline definitions.
# Luhn Checksum
The mod-10 check behind card numbers and IMEIs, demoing the [`p/moul/x/daily/luhn`](/p/moul/x/daily/luhn/v0) library.
Append a number to the path to check it — spaces and hyphens are ignored.
## Samples
| number | valid? | note |
|---|---|---|
| `79927398713` | ✅ valid | the textbook example |
| `79927398710` | ❌ invalid | same number, wrong check digit |
| `4539148803436467` | ✅ valid | a test card number |
| `4539148803436647` | ❌ invalid | same card, two digits swapped |
> Luhn is a **typo check, not a security check**: it catches every single-digit error and nearly every swap of adjacent digits, but anyone can compute a valid number. Never authorize anything with it.
vm/qrender output, sanitized (docs/render-security.md) and displayed in an empty-sandbox iframe — scripts, forms and popups cannot run. Links stay inert in-preview; right-click to open.