Option value design
bvssvni opened this issue · comments
Sven Nilsen commented
Dyon has no null
value, but uses some(val)
and none()
. It has a lot of common with result value, but there are a few differences.
some(x)
none()
unwrap(some(x))
returnsx
none()?
propagates an error, returning from the function
The type of option is opt
(any type) and opt[T]
.
This is designed for:
- Explicitly declare when a value is optional
- Check when mutating a variable that it also is optional
- Convenient for debugging
- Common way of handling errors