Result<T, E> class sealed

Methods

bimap<U, F>(U f(T), F g(E)) → Result<U, F>

Map a function, f, over the value of a successful Result and a function, g, over the reason of an unsuccessful Result.

failureOrNull() → E?

Returns the failure reason, or null if the Result is a success.

filterNotNull(E failureDescription()) → Result<T, E>

Available on Result<T?, E>, provided by the ResultNullableExtensions extension

Convert a Success of a nullable value to a Success of a non-null value or a Failure, using failureDescription as the failure reason, if the value is null.

flatMap<U>(Result<U, E> f(T)) → Result<U, E>

Flat-map a function over the value of a successful Result.

flatMapFailure<F>(Result<T, F> f(E)) → Result<T, F>

Flat-map a function over the reason of an unsuccessful Result.

fold<U>(U f(T), U g(E)) → U

Fold a function, f, over the value of a successful Result and a function, g, over the reason of an unsuccessful Result where both functions result in a value of the same type.

get() → T

Available on Result<T, T>, provided by the ResultSameType extension

Unwrap a Result in which both the success and failure values have the same type.

map<U>(U f(T)) → Result<U, E>

Map a function over the value of a successful Result.

mapFailure<F>(F f(E)) → Result<T, F>

Map a function over the reason of an unsuccessful Result.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

onNull(Never block()) → Result<T, E>

Available on Result<T?, E>, provided by the ResultNullableExtensions extension

Convert a Success of a nullable value to a Success of a non-null value, or calling block to abort if the value is null.

peek(void f(T)) → Result<T, E>

Perform a side effect with the success value.

peekFailure(void f(E)) → Result<T, E>

Perform a side effect with the failure reason.

toString() → String

A string representation of this object.

inherited

valueOrNull() → T?

Returns the success value, or null if the Result is a failure.