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gnese.kotlin-result-ext.0.1.source-code.option.kt Maven / Gradle / Ivy

fun  T?.isSome(): Boolean = this != null

fun  T?.isNull(): Boolean = !isSome()

fun  T?.map(block: (T) -> U): U? = this?.let(block)

fun  T?.mapOr(default: U, block: (T) -> U): U = map(block) ?: default

fun  T?.mapOrElse(default: () -> U, block: (T) -> U): U = map(block) ?: default()

fun  T?.successOr(failure: F): Result =
    if (this != null) {
        Result.success(this)
    } else {
        Result.failure(failure)
    }

fun  T?.successOrElse(failure: () -> F): Result =
    if (this != null) {
        Result.success(this)
    } else {
        Result.failure(failure())
    }

fun  T?.and(other: U?): U? = this?.let { other }

fun  T?.filter(block: (T) -> Boolean): T? = this?.let(block)?.let { if (it) this else null }

fun  T?.or(other: T?): T? = this ?: other

fun  T?.orElse(block: () -> T?) = this ?: block()