builder

Main.kt

fun main() {
    val builder = Sms.Builder()
    val message = builder.from("5127208800").to("9727404318").body("Hey, what's up?").build()
    message.send()
}

data class Sms private constructor(var to: String, var from: String, var body: String){

    fun send(){}//TODO()

    class Builder{
        private val message = Sms("","","")

        fun to(to: String) = this.apply { message.to = to }

        fun from(from: String) = this.apply { message.from = from }

        fun body(body: String) = this.apply { message.body = body }

        fun build() = message
    }
}