Kotlin DSL Builder Sample.kt

fun main() {

    user {
        name = "Teyyihan"
        age = 22
        tweet {
            title = "Hi"
            body = "body"
            timestamp = 1231231L
        }
    }

}

inline fun user(crossinline block: User.() -> Unit = {}): User {
    val user = User()
    user.block()
    return user
}

inline fun User.tweet(crossinline block: Tweet.() -> Unit = {}): Tweet {
    val tweet = Tweet()
    tweet.block()
    this.tweet = tweet
    return tweet
}

data class User(
    var name: String = "",
    var age: Int = 0,
    var tweet: Tweet = Tweet()
)

data class Tweet(
    var title: String = "",
    var body: String = "",
    var timestamp: Long = 0L
)