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My code snippets are below
import scala.collection.mutable.HashMap
val crossingMap = new HashMap[String, Option[Long]]
val crossingData: String = ...
val time: Long = crossingMap.get(crossingData).getOrElse(0)
I get the following compile error
error: type mismatch;
found : Any
required: Long
val time: Long = crossingMap.get(crossingData).getOrElse(0)
626
HashMap is a part of Scala Collection's. It is used to store element and return a map. A HashMap is a combination of key and value pairs which are stored using a Hash Table data structure. It provides the basic implementation of Map.
a) The values can be stored in a map by forming a key-value pair. The value can be retrieved using the key by passing it to the correct method. b) If no element exists in the Map, it will throw a 'NoSuchElementException'. c) HashMap stores only object references.
You might want crossingMap to contain String -> Long pairs. Then you can do the following,
val crossingMap = new HashMap[String, Long]
val crossingData: String = ""
val time: Long = crossingMap.getOrElse(crossingData, 0)
If you really do want the crossingMap values to have type Option[Long], then you'll have to do something like,
val crossingMap = new HashMap[String, Option[Long]]
val crossingData: String = ""
val time: Long = crossingMap.getOrElse(crossingData, None).getOrElse(0)
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