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Scala MCQs

Which of the following code snippets correctly represent Type inference on map method of Scala collections?

case class MapResult(input: Any, output: Map[_ <: Any, Any]) { override def toString = output.map(p => input + " " + p._1 + " " + p._2 ).mkString("\n") }

case class MapResult(input: Any, output: Map[_ <: Any, Any]) { override def toString = output.map(p: (Any, Any) => input + " " + p._1 + " " + p._2 ).mkString("\n") }

case class MapResult(input: Any, output: Map[_ <: Any, Any]) { override def toString = output.map{ case (k: Any, v: Any) => input + " " + k + " " + v }.mkString("\n") }

All of the above

Answer

Correct Answer: case class MapResult(input: Any, output: Map[_ <: Any, Any]) { override def toString = output.map{ case (k: Any, v: Any) => input + " " + k + " " + v }.mkString("\n") }

Explanation:

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