micro_utils.dokka/dev.inmo.micro_utils.common/[common]Optional

Optional

data class Optional<T>

This type represents T as not only potentially nullable data, but also as a data which can not be presented. This type will be useful in cases when T is nullable and null as valuable data too in time of data absence should be presented by some third type.

Let's imagine, you have nullable name in some database. In case when name is not nullable everything is clear - null will represent absence of row in the database. In case when name is nullable null will be a little bit dual-meaning, cause this null will say nothing about availability of the row (of course, it is exaggerated example)

See also

dev.inmo.micro_utils.common.Optional.Companion

Optional.optional

Optional.onPresented

Optional.onAbsent

Types

object Companion

Properties

val data: T?

val dataPresented: Boolean

Extensions

dataOrElse

inline fun <T> Optional<T>.dataOrElse(block: () -> T): T

Returns Optional.data if Optional.dataPresented of this is true, or call block and returns the result of it

inline fun <T> Optional<T>.dataOrElse(block: () -> T): T

Returns Optional.data if Optional.dataPresented of this is true, or call block and returns the result of it

inline fun <T> Optional<T>.dataOrElse(block: () -> T): T

Returns Optional.data if Optional.dataPresented of this is true, or call block and returns the result of it

dataOrNull

fun <T> Optional<T>.dataOrNull(): T?

Returns Optional.data if Optional.dataPresented of this is true, or null otherwise

fun <T> Optional<T>.dataOrNull(): T?

Returns Optional.data if Optional.dataPresented of this is true, or null otherwise

fun <T> Optional<T>.dataOrNull(): T?

Returns Optional.data if Optional.dataPresented of this is true, or null otherwise

dataOrThrow

fun <T> Optional<T>.dataOrThrow(throwable: Throwable): T

Returns Optional.data if Optional.dataPresented of this is true, or throw throwable otherwise

fun <T> Optional<T>.dataOrThrow(throwable: Throwable): T

Returns Optional.data if Optional.dataPresented of this is true, or throw throwable otherwise

fun <T> Optional<T>.dataOrThrow(throwable: Throwable): T

Returns Optional.data if Optional.dataPresented of this is true, or throw throwable otherwise

mapOnAbsent

inline fun <T, R> Optional<T>.mapOnAbsent(block: () -> R): R?

Will call block when data presented (Optional.dataPresented == true)

inline fun <T, R> Optional<T>.mapOnAbsent(block: () -> R): R?

Will call block when data presented (Optional.dataPresented == true)

inline fun <T, R> Optional<T>.mapOnAbsent(block: () -> R): R?

Will call block when data presented (Optional.dataPresented == true)

mapOnPresented

inline fun <T, R> Optional<T>.mapOnPresented(block: (T) -> R): R?

Will call block when data presented (Optional.dataPresented == true)

inline fun <T, R> Optional<T>.mapOnPresented(block: (T) -> R): R?

Will call block when data presented (Optional.dataPresented == true)

inline fun <T, R> Optional<T>.mapOnPresented(block: (T) -> R): R?

Will call block when data presented (Optional.dataPresented == true)

onAbsent

inline fun <T> Optional<T>.onAbsent(block: () -> Unit): Optional<T>

Will call block when data absent (Optional.dataPresented == false)

inline fun <T> Optional<T>.onAbsent(block: () -> Unit): Optional<T>

Will call block when data absent (Optional.dataPresented == false)

inline fun <T> Optional<T>.onAbsent(block: () -> Unit): Optional<T>

Will call block when data absent (Optional.dataPresented == false)

onPresented

inline fun <T> Optional<T>.onPresented(block: (T) -> Unit): Optional<T>

Will call block when data presented (Optional.dataPresented == true)

inline fun <T> Optional<T>.onPresented(block: (T) -> Unit): Optional<T>

Will call block when data presented (Optional.dataPresented == true)

inline fun <T> Optional<T>.onPresented(block: (T) -> Unit): Optional<T>

Will call block when data presented (Optional.dataPresented == true)