None<T> class

None represents the absence of a value in Option.

Inheritance

• Object
• Option<T>
• None

Available extensions

• OptionExtensions
• OptionToNullable

Constructors

None()

Constructs nothing

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

isNone → bool

Returns true if the option is None, false otherwise.

no setter, inherited

isSome → bool

Returns true if the option is Some, false otherwise.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

bind<U>(Option<U> f(T)) → Option<U>

Available on Option<T>, provided by the OptionExtensions extension

Returns a new Option from an existing Option

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

someOr(T orElse()) → T

Available on Option<T>, provided by the OptionExtensions extension

Returns the value if it is some, or the result of orElse if it is none.

toNullable() → T?

Available on Option<T>, provided by the OptionToNullable extension

Returns the value if it exists, otherwise null

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited

operator >>(Option<T> transform(T)) → Option<T>

Available on Option<T>, provided by the OptionExtensions extension

Performs a bind operation

operator |(T or) → T

Available on Option<T>, provided by the OptionExtensions extension

Returns the value if it exists, otherwise returns or