Option<T> extension type

Option represents the union of two types - Some<T> and None. As an extension Option$type of T?, Option<T> has the same runtime cost of T? with the advantage of being able to chain null specific operations.

on

• T?

Available extensions

• Option$OptionMethodsExtension
• Option$OptionNestedRecord3Extension
• Option$OptionNestedRecord4Extension
• Option$OptionNestedRecord5Extension
• Option$OptionNullableExtension
• Option$OptionOptionExtension
• Option$OptionRecord2Extension
• Option$OptionResultExtension
• Option$ToFutureOptionExtension

Constructors

Option(_OptionEarlyReturnFunction<T> fn)

Creates a context for early return, similar to "Do notation". Works like the Rust "?" operator, which is a "Early Return Operator". Here "$" is used as the "Early Return Key". when "$" is used on a type _None, immediately the context that "$" belongs to is returned with None(). e.g.

factory

Option.from(T? v)

Converts from T? to Option<T>.

Properties

v → T?

final

Static Methods

async<T>(_OptionAsyncEarlyReturnFunction<T> fn) → Future<Option<T>>

Creates a context for async early return, similar to "Do notation". Works like the Rust "?" operator, which is a "Early Return Operator". Here "$" is used as the "Early Return Key". when "$" is used on a type _None, immediately the context that "$" belongs to is returned with None(). e.g.