本文方法及代码示例基于Kotlin 2.1.20 Released
filterNot
所在包 kotlin.collections.filterNot
,其相关用法介绍如下:
用法一
kotlin
inline fun <T> Array<out T>.filterNot(
predicate: (T) -> Boolean
): List<T>
inline fun ByteArray.filterNot(
predicate: (Byte) -> Boolean
): List<Byte>
inline fun ShortArray.filterNot(
predicate: (Short) -> Boolean
): List<Short>
inline fun IntArray.filterNot(
predicate: (Int) -> Boolean
): List<Int>
inline fun LongArray.filterNot(
predicate: (Long) -> Boolean
): List<Long>
inline fun FloatArray.filterNot(
predicate: (Float) -> Boolean
): List<Float>
inline fun DoubleArray.filterNot(
predicate: (Double) -> Boolean
): List<Double>
inline fun BooleanArray.filterNot(
predicate: (Boolean) -> Boolean
): List<Boolean>
inline fun CharArray.filterNot(
predicate: (Char) -> Boolean
): List<Char>
inline fun <T> Iterable<T>.filterNot(
predicate: (T) -> Boolean
): List<T>
@ExperimentalUnsignedTypes inline fun UIntArray.filterNot(
predicate: (UInt) -> Boolean
): List<UInt>
@ExperimentalUnsignedTypes inline fun ULongArray.filterNot(
predicate: (ULong) -> Boolean
): List<ULong>
@ExperimentalUnsignedTypes inline fun UByteArray.filterNot(
predicate: (UByte) -> Boolean
): List<UByte>
@ExperimentalUnsignedTypes inline fun UShortArray.filterNot(
predicate: (UShort) -> Boolean
): List<UShort>
返回一个列表,其中包含与给定 predicate 不匹配的所有元素。
示例代码:
kotlin
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val numbers: List<Int> = listOf(1, 2, 3, 4, 5, 6, 7)
val evenNumbers = numbers.filter { it % 2 == 0 }
val notMultiplesOf3 = numbers.filterNot { number -> number % 3 == 0 }
println(evenNumbers) // [2, 4, 6]
println(notMultiplesOf3) // [1, 2, 4, 5, 7]
//sampleEnd
}
// 输出
[2, 4, 6]
[1, 2, 4, 5, 7]
用法二
kotlin
inline fun <K, V> Map<out K, V>.filterNot(
predicate: (Entry<K, V>) -> Boolean
): Map<K, V>
返回一个包含与给定 predicate 不匹配的所有键值对的新映射。
返回的映射保留原始映射的条目迭代顺序。
示例代码:
kotlin
import kotlin.test.*
import java.util.*
fun main(args: Array<String>) {
//sampleStart
val originalMap = mapOf("key1" to 1, "key2" to 2, "key3" to 3)
val filteredMap = originalMap.filterNot { it.value < 3 }
println(filteredMap) // {key3=3}
// original map has not changed
println(originalMap) // {key1=1, key2=2, key3=3}
val matchAllPredicate: ((Map.Entry<String, Int>)) -> Boolean = { it.value > 0 }
val emptyMap = originalMap.filterNot(matchAllPredicate)
println(emptyMap) // {}
//sampleEnd
}
// 输出
{key3=3}
{key1=1, key2=2, key3=3}
{}
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