Kotlin dropLastWhile用法及代码示例

QING6182025-04-01 11:40

本文方法及代码示例基于Kotlin 2.1.20 Released

dropLastWhile 所在包 kotlin.collections.dropLastWhile，其相关用法介绍如下：

用法

kotlin 复制代码

inline fun <T> Array<out T>.dropLastWhile(
    predicate: (T) -> Boolean
): List<T>

inline fun ByteArray.dropLastWhile(
    predicate: (Byte) -> Boolean
): List<Byte>

inline fun ShortArray.dropLastWhile(
    predicate: (Short) -> Boolean
): List<Short>

inline fun IntArray.dropLastWhile(
    predicate: (Int) -> Boolean
): List<Int>

inline fun LongArray.dropLastWhile(
    predicate: (Long) -> Boolean
): List<Long>

inline fun FloatArray.dropLastWhile(
    predicate: (Float) -> Boolean
): List<Float>

inline fun DoubleArray.dropLastWhile(
    predicate: (Double) -> Boolean
): List<Double>

inline fun BooleanArray.dropLastWhile(
    predicate: (Boolean) -> Boolean
): List<Boolean>

inline fun CharArray.dropLastWhile(
    predicate: (Char) -> Boolean
): List<Char>

inline fun <T> List<T>.dropLastWhile(
    predicate: (T) -> Boolean
): List<T>

@ExperimentalUnsignedTypes inline fun UIntArray.dropLastWhile(
    predicate: (UInt) -> Boolean
): List<UInt>

@ExperimentalUnsignedTypes inline fun ULongArray.dropLastWhile(
    predicate: (ULong) -> Boolean
): List<ULong>

@ExperimentalUnsignedTypes inline fun UByteArray.dropLastWhile(
    predicate: (UByte) -> Boolean
): List<UByte>

@ExperimentalUnsignedTypes inline fun UShortArray.dropLastWhile(
    predicate: (UShort) -> Boolean
): List<UShort>

返回一个列表，其中包含除满足给定 predicate 的最后一个元素之外的所有元素。

代码例子

kotlin 复制代码

import kotlin.test.*

fun main(args: Array<String>) {
    //sampleStart
    val chars = ('a'..'z').toList()
    println(chars.drop(23)) // [x, y, z]
    println(chars.dropLast(23)) // [a, b, c]
    println(chars.dropWhile { it < 'x' }) // [x, y, z]
    println(chars.dropLastWhile { it > 'c' }) // [a, b, c]
    //sampleEnd
}

// 输出
[x, y, z]
[a, b, c]
[x, y, z]
[a, b, c]