Tag: invoke

fun main() {
    val game = Game()

    var gameIsNotEnded = true

    while (gameIsNotEnded) {
        print("Enter a direction: N/S/E/W:")
        gameIsNotEnded = game.makeMove(readLine())
    }
}

enum class Directions {
    NORTH, SOUTH, EAST, WEST, START, END
}

class Game {
    var path = mutableListOf(Directions.START)
    val north = {path.add(Directions.NORTH)}
    val south = {path.add(Directions.SOUTH)}
    val east = {path.add(Directions.EAST)}
    val west = {path.add(Directions.WEST)}
    val end = {path.add(Directions.END); println("Game Over");false}

    fun makeMove(moveDir: String?): Boolean {
        return when (moveDir) {
            "N" -> move(north) // This passes the 'north' lambda into the move function
            "S" -> move(south)
            "E" -> move(east)
            "W" -> move(west)
            else -> move(end)
        }
    }
}

fun move(where: () -> Boolean): Boolean { // Here we take a lambda as an argument
    return where.invoke() // The lambda will be invoked when called
}