kotlin的takeIf简单使用理解

Posted 2022-12-16 zhangjin1120

fun main() 
    var name = "Nina"
    TakeIfTest().takeIf 
        it.isGirl(name)
    ?.doSomething(name)

    name = "Tom"
    TakeIfTest().takeIf 
        it.isGirl(name)
    ?.doSomething(name)

    name = "Anna"
    TakeIfTest().takeIf 
        it.isGirl(name)
    ?.doSomething(name)


class TakeIfTest 
    fun doSomething(name: String) 
        println(name)
    

    fun isGirl(name: String): Boolean 
        return when (name) 
            "Jake" -> 
                false
            
            "Nina" -> 
                true
            
            "Anna" ->
                true
            
            else -> 
                false
            
        
    

运行结果：