本文方法及代码示例筛选整理自kotlinlang.org------Kotlin 2.1.20 Released
ifBlank
所在包 kotlin.text.ifBlank
,其相关用法介绍如下:
用法:
kotlin
inline fun <C, R> C.ifBlank(
defaultValue: () -> R
): R where C : CharSequence, C : R
- 如果此字符序列不为空且不仅包含空白字符,则返回此字符序列,否则返回调用 defaultValue 函数的结果。
代码示例:
kotlin
import java.util.Locale
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val blank = " "
val blankOrNull: String? = blank.ifBlank { null }
println(blankOrNull) // null
val blankOrDefault = blank.ifBlank { "default" }
println(blankOrDefault) // default
val nonBlank = "abc"
val sameString = nonBlank.ifBlank { "def" }
println("nonBlank === sameString is ${nonBlank === sameString}") // true
//sampleEnd
}
// 输出
null
default
nonBlank === sameString is true