Coroutine Basics in Kotlin

// Coroutine scope and launch
import kotlinx.coroutines.*

fun main() = runBlocking {
    launch {
        delay(1000)
        println("World")
    }
    println("Hello")
}

// Async and await
suspend fun fetchUser(): User {
    delay(1000)  // Simulated network call
    return User("Alice")
}

suspend fun fetchPosts(): List<Post> {
    delay(1000)
    return listOf(Post("Title"))
}

fun main() = runBlocking {
    val user = async { fetchUser() }
    val posts = async { fetchPosts() }

    println("User: ${user.await()}")
    println("Posts: ${posts.await()}")
}

// Suspend functions
suspend fun doWork() {
    delay(1000)
    println("Work done")
}