Result<T extends Object, E extends Exception> class sealed

Result

Result has two variants: Ok and Err

final Result<String, Exception> result =
switch(result) {
  return switch (this) {
    Ok(:T value) => value,
    Err(:E err) => throw err,
  };
}

Ok

An Ok can be created with a value

final ok1 = Ok<String, Exception>('Hi');
final ok2 = Result<String, Exception>.ok('Hi');

Err

An Err can be created with an exception

final err1 = Result<String, Exception>.err(Exception('Unexpected'));
final err2 = Err<String, Exception>(Exception('Unexpected'));

Implementers

• Err
• Ok

Constructors

Result.err(E err)

Err

factory

Result.ok(T value)

Ok

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

map<U extends Object>(U onOk(T)) → Result<U, E>

Maps the value from T to U if it is Ok, else, keeps the Err, E.

mapErr<E2 extends Exception>(E2 onErr(E)) → Result<T, E2>

Maps the error from E to E2 if it is Err, else, keeps the Ok, T.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

unwrap() → T

Unsafe operations that returns T or throw E

unwrapErr() → E

Unsafe operations that returns E or throw an Exception

unwrapOrNull() → T?

Returns T on Ok, or null on Err

Operators

operator ==(Object other) → bool

The equality operator.

inherited