Either<L, R> class sealed

Represents a value that can be either a Left (error) or Right (success).

Either is commonly used in functional programming to handle computations that may fail without throwing exceptions.

Implementers
Available extensions

Properties

hashCode → int
The hash code for this object.
no setterinherited
isLeft → bool
Returns true if this is a Left
no setter
isRight → bool
Returns true if this is a Right
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

filter(bool predicate(R), L orElse()) → Either<L, R>

Available on Either<L, R>, provided by the EitherExtensions extension

Filters the right value with a predicate, converting to Left if false
flatMap<R2>(Either<L, R2> f(R)) → Either<L, R2>
Flat maps the right value if this is a Right
flatMapLeft<L2>(Either<L2, R> f(L)) → Either<L2, R>
Flat maps the left value if this is a Left
fold<T>(T onLeft(L), T onRight(R)) → T
Folds this Either into a single value
getOrElse(R defaultValue) → R
Returns the right value if this is a Right, otherwise returns the default value
getOrElseGet(R defaultValue()) → R
Returns the right value if this is a Right, otherwise computes and returns a default value
map<R2>(R2 f(R)) → Either<L, R2>
Maps the right value if this is a Right, otherwise returns this Left unchanged
mapLeft<L2>(L2 f(L)) → Either<L2, R>
Maps the left value if this is a Left, otherwise returns this Right unchanged
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
swap() → Either<R, L>
Swaps Left and Right
toList() → List<R>

Available on Either<L, R>, provided by the EitherExtensions extension

Converts this Either to a list, containing the right value or empty for Left
toNullable() → R?

Available on Either<L, R>, provided by the EitherExtensions extension

Converts this Either to a nullable value, returning null for Left
toString() → String
A string representation of this object.
override

Operators

operator ==(Object other) → bool
The equality operator.
inherited

Static Methods

left<L, R>(L value) → Either<L, R>
Creates a Left value (typically representing an error)
Creates a Right value (typically representing success)