Err<T, E> class final

An erroneous Result.

Inheritance

• Object
• Result<T, E>
• Err

Available extensions

• ErroneousResult
• FlattenedResult
• SuccessfulResult
• TransposedResult

Constructors

Err(E error)

Creates an erroneous Result with the given error.

const

Properties

err → Some<E>

The possibly contained error.

no setter, override

error → E

The contained error.

final

error → E

Available on Result<Never, E>, provided by the ErroneousResult extension

Returns the contained error.

no setter

errorOrNull → E

The contained error if this is an Err, or null otherwise.

no setter, override

flattened → Result<T, E>

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

Flattens a Result containing another Result.

no setter

hashCode → int

The hash code for this object.

no setter, override

isErr → bool

Whether this is an Err.

no setter, override

isOk → bool

Whether this is an Ok.

no setter, override

iterable → Iterable<T>

Returns an iterable over the possibly contained value.

no setter, override

ok → None<T>

The possibly contained value.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

transposed → Option<Result<T, E>>

Available on Result<Option<T>, E>, provided by the TransposedResult extension

A Result containing an Option transposed into an Option containing a Result.

no setter

value → T

Available on Result<T, Never>, provided by the SuccessfulResult extension

Returns the contained value.

no setter

valueOrNull → Null

The contained value if this is an Ok, or null otherwise.

no setter, override

Methods

and<U>(Result<U, E> other) → Err<U, E>

Returns other if this is an Ok, or an Err of the original error otherwise.

override

andThen<U>(Result<U, E> calculateOther(T value)) → Err<U, E>

Returns the result of calculateOther if this is an Ok, or an Err of the original error otherwise.

override

contains(T value) → bool

Returns true if this is an Ok with the given value.

override

containsErr(E error) → bool

Returns true if this is an Err with the given error.

override

inspect(void inspect(T value)) → Err<T, E>

Calls inspect with the contained value if this is an Ok.

override

inspectErr(void inspect(E error)) → Err<T, E>

Calls inspect with the contained error if this is an Err.

override

isErrAnd(bool condition(E error)) → bool

Returns true if this is an Err with a contained error that satisfies condition.

override

isOkAnd(bool condition(T value)) → bool

Returns true if this is an Ok with a contained value that satisfies condition.

override

map<U>(U map(T value)) → Err<U, E>

Transforms the contained value, if any, by applying map to it.

override

mapErr<F>(F map(E error)) → Err<T, F>

Transforms the contained error, if any, by applying map to it.

override

mapErrOr<F>(F map(E error), F defaultError) → F

Returns the contained error, if any, with map applied to it, or defaultError otherwise.

override

mapErrOrElse<F>(F map(E error), F calculateDefaultError(T value)) → F

Returns the contained error, if any, with map applied to it, or the result of calculateDefaultError otherwise.

override

mapOr<U>(U map(T value), U defaultValue) → U

Returns the contained value, if any, with map applied to it, or defaultValue otherwise.

override

mapOrElse<U>(U map(T value), U calculateDefaultValue(E error)) → U

Returns the contained value, if any, with map applied to it, or the result of calculateDefaultValue otherwise.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

or<F>(Result<T, F> other) → Result<T, F>

Returns an Ok of the original value if this is an Ok, or other otherwise.

override

orElse<F>(Result<T, F> calculateOther(E error)) → Result<T, F>

Returns an Ok of the original value if this is an Ok, or the result of calculateOther otherwise.

override

toString() → String

A string representation of this object.

override

unwrap({String? msg}) → Never

Returns the contained value.

override

unwrapErr({String? msg}) → E

Returns the contained error.

override

unwrapErrOr(E defaultError) → E

Returns the contained error, if any, or defaultError otherwise.

override

unwrapErrOrElse(E calculateDefaultError(T value)) → E

Returns the contained error, if any, or the result of calculateDefaultError otherwise.

override

unwrapOr(T defaultValue) → T

Returns the contained value, if any, or defaultValue otherwise.

override

unwrapOrElse(T calculateDefaultValue(E error)) → T

Returns the contained value, if any, or the result of calculateDefaultValue otherwise.

override

Operators

operator ==(covariant Result<T, E> other) → bool

The equality operator.

override