kone.maybe/dev.lounres.kone.maybe/None

None

data object None : Maybe<Nothing> (source)

Just a simple marker of a value absence that is a part of Maybe purpose. See its docs for more.

Functions

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inline fun <Element, Result> Maybe<Element>.computeOn(compute: (Element) -> Result): Maybe<Result>

Computes the compute on the value and returns it wrapped in Some if the value is present or just returns None otherwise.

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inline fun <Element, Result> Maybe<Element>.computeOnOrDefault(default: Result, compute: (Element) -> Result): Result

Computes the compute on the value and returns it if the value is present or just returns default one otherwise.

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inline fun <Element, Result> Maybe<Element>.computeOnOrElse(default: () -> Result, compute: (Element) -> Result): Result

Computes the compute on the value and returns it if the value is present or just computes and returns default one otherwise.

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fun <Element> Maybe<Maybe<Element>>.flatten(): Maybe<Element>

Returns the wrapped in Some instance of type Maybe<E> if it is present or None otherwise.

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fun Maybe<*>.isNone(): Boolean

Returns true if the value is absent.

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fun Maybe<*>.isSome(): Boolean

Returns true if the value is present.

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fun <Element> Maybe<Element>.orDefault(default: Element): Element

Returns the value if it is present or default one otherwise.

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inline fun <Element> Maybe<Element>.orElse(default: () -> Element): Element

Returns the value if it is present or computes and returns default one otherwise.

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inline fun <Element> Maybe<Element>.orThrow(error: () -> Throwable): Element

Returns the value if it is present or throws the provided exception otherwise.