std.result
Error handling type.
Types
type Result e t =
| Err e
| Ok t
Result
represents either success (Ok
) or an error (Err
)
Values
let unwrap_ok_or default res : forall e a . a -> Result e a -> a
let unwrap_err res : forall a e . Result e a -> e
let unwrap_err_or default res : forall a e . e -> Result e a -> e
Eq a
defines equality (==) on a
Ord a
defines an ordering on a
A Functor
represents an action on a parameterized type which does not
change the structure with the mapped type.
The following laws should hold:
map id == id
map (f << g) == map f << map g
#[implicit]
let applicative : forall e . Applicative (Result e)
A Functor
with application.
The following laws should hold:
wrap id <*> v = v
wrap (<<) <*> u <*> v <*> w = u <*> (v <*> w)
wrap f <*> wrap x = wrap (f x)
u <*> wrap y = wrap (\g -> g x) <*> u
A generalised interface for imperatively sequencing actions
Operations over a data structure that can be folded which means that a functions gets called on
each element to reduce the structure to a single value (Array
, List
and Map
are all Foldable
)
#[implicit]
let traversable : forall e . Traversable (Result e)
Show a
represents a conversion function from a
to a readable string.