Err<T, E> class
final
Represents a failed value.
Constructors
- Err(E error)
-
const
Properties
-
err
→ Err<
T, E> -
Get the Err value or throw an error if it's Ok.
no setterinherited
- error → E
-
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- isErr → bool
-
no setterinherited
- isOk → bool
-
no setterinherited
-
ok
→ Ok<
T, E> -
Get the Ok value or throw an error if it's Err.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
andThen<
U> (Result< U, E> fn(T value)) → Result<U, E> -
Applies a function to the value inside Ok if it exists, otherwise
returns Err.
inherited
-
fold<
B> (B onOk(T value), B onErr(E error)) → B -
Fold is used to handle both Ok and Err cases.
override
-
getOrElse(
T defaultValue()) → T -
If the Result is Ok, provides a default value; otherwise, executes
the error function.
inherited
-
isErrAnd(
bool predicate(E error)) → bool -
Check if Result is Err and the error satisfies a predicate.
inherited
-
isOkAnd(
bool predicate(T value)) → bool -
Check if Result is Ok and the value satisfies a predicate.
inherited
-
map<
U> (U fn(T value)) → Result< U, E> -
Maps the value inside Ok if it exists, keeping Err unchanged.
inherited
-
mapAsync<
U> (Future< U> fn(T value)) → Future<Result< U, E> > -
Maps the value inside Ok asynchronously, keeping Err unchanged.
inherited
-
mapErr<
F> (F fn(E error)) → Result< T, F> -
Maps the error inside Err if it exists, keeping Ok unchanged.
inherited
-
mapOrElse<
U> (U onOk(T value), U onErr(E error)) → Result< U, E> -
If it's Ok, apply the function to the value; otherwise, return the
original Result.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
orElse(
Result< T, E> alternative()) → Result<T, E> -
If this Result is Err, provides a default value (or another Result).
inherited
-
toOption(
) → Option< T> -
Convert to Option, where Ok becomes Some and Err becomes None.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
-
unwrap(
) → T -
Unwrap the value or throw an error if it's Err.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited