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
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
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]
