# bin/zeros
Build a byte string of `n` NUL bytes (0x00). Useful as the buffer for
`bin/set-*` writes and as a scratch region for protocol framing.
## Syntax
[bin/zeros $n]
## Parameters
- `$n` — number of zero bytes
## Examples
[bytes/len [bin/zeros 16]] # → 16 [bin/u8-at [bin/zeros 4] 0] # → 0
## Returns
Byte string of length `n`. A negative count returns `%Err{:message}`.
## See Also
`bin/bytes`, `bin/set-u8`