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reduce() without identity

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This commit is contained in:
DBotThePony 2024-05-29 12:33:40 +07:00
parent 817a2f8459
commit 373b7ce682
Signed by: DBot
GPG Key ID: DCC23B5715498507
2 changed files with 11 additions and 1 deletions
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2
gradle.properties
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@ -4,7 +4,7 @@ kotlin.code.style=official
specifyKotlinAsDependency=false specifyKotlinAsDependency=false
projectGroup=ru.dbotthepony.kommons projectGroup=ru.dbotthepony.kommons
projectVersion=2.18.0 projectVersion=2.18.1
guavaDepVersion=33.0.0 guavaDepVersion=33.0.0
gsonDepVersion=2.8.9 gsonDepVersion=2.8.9

10
src/main/kotlin/ru/dbotthepony/kommons/collect/StreamyIterators.kt
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@ -1,5 +1,6 @@
package ru.dbotthepony.kommons.collect package ru.dbotthepony.kommons.collect
import ru.dbotthepony.kommons.util.KOptional
import java.util.* import java.util.*
import java.util.function.Predicate import java.util.function.Predicate
import java.util.stream.Collector import java.util.stream.Collector
@ -218,6 +219,15 @@ inline fun <T> Iterator<T>.reduce(identity: T, reducer: (T, T) -> T): T {
return result return result
} }
inline fun <T> Iterator<T>.reduce(reducer: (T, T) -> T): KOptional<T> {
if (!hasNext())
return KOptional()
var result = next()
while (hasNext()) result = reducer.invoke(result, next())
return KOptional(result)
}
fun <T> Iterator<T?>.filterNotNull(): MutableIterator<T> = filter { it != null } as MutableIterator<T> fun <T> Iterator<T?>.filterNotNull(): MutableIterator<T> = filter { it != null } as MutableIterator<T>
inline fun <reified T> Iterator<*>.filterIsInstance(): MutableIterator<T> = filter { it is T } as MutableIterator<T> inline fun <reified T> Iterator<*>.filterIsInstance(): MutableIterator<T> = filter { it is T } as MutableIterator<T>