Counter with History - Scala Typing CST Test

Counter with History — Scala Code

A console-based Scala counter that logs each increment/decrement action in a history list.

object CounterWithHistory {
	var count = 0
	var history = List[String]()

	def updateUI(): Unit = {
		println(s"Counter: $count")
		println(s"History: ${history.mkString(", ")}")
	}

	def increment(): Unit = { count += 1; history = history :+ s"Incremented to $count"; updateUI() }
	def decrement(): Unit = { count -= 1; history = history :+ s"Decremented to $count"; updateUI() }
	def reset(): Unit = { count = 0; history = List("Counter reset"); updateUI() }

	def main(args: Array[String]): Unit = {
		updateUI()
		increment()
		increment()
		decrement()
		reset()
	}
}
CounterWithHistory.main(Array())

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