Kotlin编程语言有哪些应用场景？

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javavar email=null;email ?? println(email is empty);email?.let { println(email not empty) var current=it println(current var $current)} ?: println(not i fuck i am null)

var email=null;

email?: println("email is empty");

email?.let{
println("emali not empty");
}

var current= email?.let { "nihao" }?:"not i fuck i am null";
println("current var ${current}");