Result<T, E> class Null safety

Result is a type that represents either success (`ok`) or failure (`error`).

Annotations

Properties

hashCode int
The hash code for this object.
read-only, override
rawValue → dynamic
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
type ResultType
final

Methods

and<U>(Result<U, E> res) Result<U, E>
Returns res if the result is ok, otherwise returns the error value of class.
andThen<U>(Result<U, E> op(T val)) Result<U, E>
Calls op if the result is `Ok`, otherwise returns the `Err` value of self.
contains(T val) bool
Returns true if the result is an `ok` value containing the given value.
containsError(E err) bool
Returns true if the result is an `error` value containing the given value.
isError() bool
Returns true if the result is error.
isOk() bool
Returns true if the result is ok.
map<U>(U op(T val)) Result<U, E>
Maps a Result<T, E> to Result<U, E> by applying a function to a contained ok value, leaving an error value untouched.
mapError<F>(F op(E err)) Result<T, F>
Maps a Result<T, E> to Result<T, F> by applying a function to a contained error value, leaving an ok value untouched.
mapOr<U>(U defaultt, U op(T val)) → U
Returns the provided default (if error), or applies a function to the contained value (if ok),
mapOrElse<U>(U defaultt(E err), U op(T val)) → U
Maps a Result<T, E> to U by applying a fallback function to a contained error value, or a default function to a contained ok value.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
or<F>(Result<T, F> res) Result<T, F>
Returns res if the result is error, otherwise returns the ok value of class.
orElse<F>(Result<T, F> op(E err)) Result<T, F>
Calls op if the result is error, otherwise returns the ok value of class`.
toString() String
A string representation of this object.
override
unwrap() → T
Returns the contained ok value.
unwrapError() → E
Returns the contained error value.
unwrapOr(T instance) → T
Returns the contained ok value or a provided default.
unwrapOrElse(T op(E err)) → T
Returns the contained ok value or computes it from a closure.

Operators

operator ==(Object other) bool
The equality operator.
override

Static Methods

error<T, E>(E err) Result<T, E>
ok<T, E>(T val) Result<T, E>