Optional

Optional type allows you to have a value that may or may not be there when serializing and deserializing.

sd.optional takes sd, a sd.SerDes that will serialize if there is a value.

Usage

Optional number.

const { toBytes, fromBytes } = sd.use(sd.optional(sd.uint8));

Specifications

sd.optional uses a one byte header which is a boolean value to indicate if it has a value or not.

If value is not undefined or null

[byte 1][value (sd)]

Otherwise

[byte 0]