Kotlin打字技巧：掌握Kotlin语法，提升编码速度

val name: String? = null

val length = name?.length ?: 0

val result = name?.let { it.uppercase() }

data class User(val name: String, val age: Int)

val user = User(name = "Alice", age = 30)
val copy = user.copy(age = 31)

val (name, age) = user

fun greet(name: String): String = "Hello, $name!"

fun sum(a: Int, b: Int) = a + b

fun String.addExclamation() = "$this!"

val sum = { a: Int, b: Int -> a + b }

list.filter { it > 0 }.map { it * 2 }

list.forEach { println(it) }

launch {
    val result = async { fetchData() }.await()
}

flow {
    emit(data)
}.collect { value ->
    process(value)
}