Either<LEFT, RIGHT> class

Represents a union type of LEFT and RIGHT. Holds either a LEFT value or a RIGHT value, but never both.

Constructors

Either.left(LEFT value)
Produces an Either containing a value of LEFT.
factory
Either.right(RIGHT value)
Produces an Either containing a value of RIGHT.
factory

Properties

hashCode → int
The hash code for this object.
no setterinherited
isLeft → bool
Tells whether this contains an instance of LEFT object.
no setter
isRight → bool
Tells whether this contains an instance of RIGHT.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

ifLeft<RETURN>(RETURN onLeft(LEFT left)) → Option<RETURN>
Calls onLeft if this.isLeft and returns its value in an Option.
ifLeftAsync<RETURN>(Future<RETURN> onLeft(LEFT left)) → Future<Option<RETURN>>
Async version of Either.ifLeft.
ifRight<RETURN>(RETURN onRight(RIGHT right)) → Option<RETURN>
Calls onRight if this.isRight and returns its value in an Option.
ifRightAsync<RETURN>(Future<RETURN> onRight(RIGHT right)) → Future<Option<RETURN>>
Async version of Either.ifRight.
left(LEFT fallback) → LEFT
Returns left value if present, else fallback.
leftOr(LEFT fallback()) → LEFT
Returns left value if present, else value produced by fallback.
leftOrAsync(Future<LEFT> fallback()) → Future<LEFT>
Async version of Either.leftOr.
leftUnsafe() → LEFT?
Returns the left value as nullable. Only use this if necessary.
match<RETURN>({required RETURN onLeft(LEFT left), required RETURN onRight(RIGHT right)}) → RETURN
Calls the matching function and returns its value.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
Returns right value if present, else fallback.
rightOr(RIGHT fallback()) → RIGHT
Returns right value if present, else value produced by fallback.
rightOrAsync(Future<RIGHT> fallback()) → Future<RIGHT>
Async version of Either.rightOr.
rightUnsafe() → RIGHT?
Returns the right value as nullable. Only use this if necessary.
toString() → String
A string representation of this object.
inherited

Operators

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