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class ReceiptText(private val template: String) : (Int) -> String {
override fun invoke(price: Int): String {
return template.replace("%%%", price.toString())
}
}
val receiptText = ReceiptText("The total price to pay is %%% euro")
println(receiptText(10))
fun receiptTxt(template: String): (Int) -> String {
return { price -> template.replace("%%%", price.toString()) }
}
val receiptTxt = receiptTxt("Devi pagarmi %%% soldi!")
receiptTxt(10)
object ReceiptTextObject {
operator fun invoke(price: Int): String {
return "price to pay is %%% euro".replace("%%%", price.toString())
}
}
ReceiptTextObject(101)
sealed class TemplateString {
object ReceiptTextObj {
operator fun invoke(amount: Int): String =
receipt("My receipt for $%%%")(amount)
operator fun invoke(template: String, amount: Int): String =
receipt(template)(amount)
private fun receipt(template: String): (Int) -> String {
return { price -> template.replace("%%%", price.toString()) }
}
}
}
val receipt = TemplateString.ReceiptTextObj
receipt(10)
receipt("ciao, mi devi %%% gatti...", 123)
val functions = mutableListOf<(Int) -> String>()
functions.add(receiptTxt("TA %%%"))
functions.add(ReceiptText("Thank you for $%%%!"))
functions.add(TemplateString.ReceiptTextObj::invoke)
functions.mapIndexed { i, f -> f(10 + i) }
// ---------------------------------
// Functional Type
class Add(private val x: Int) : (Int) -> Int {
override fun invoke(y: Int): Int {
return x + y
}
}
// Functional value (anonymous inner class)
val add: (Int) -> (Int) -> Int = { x: Int -> { y: Int -> x + y } }
println(add::class)
val increment = add(1)
increment(3)
val increment2 = Add(1)
increment2(2)
val addTen = Add(10)
addTen(3)
fun words(string: String): List<String> {
return string.split(" ")
}
class Splitter : (String) -> List<String> {
override fun invoke(string: String): List<String> {
return string.split(" ")
}
}
val splitter: (String) -> List<String> = { s: String -> s.split(" ") }
splitter("ciao a tutti")
listOf("ciao a tutti", "domani è domenica").flatMap(splitter)
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