[Kotlin elvis] #Kotlin

Main.kt

object StringProducer {
    fun produce(): String? {
        return "abc"
    }
}

fun main() {
    StringProducer.produce()?.let {
        println(it)
    } ?: run {
        println("StringProducer.produce() return empty")
    }

    val s = StringProducer.produce()
    if (s != null) {
        println(s)
    } else {
        println("StringProducer.produce() return empty")
    }
}