Comment¶

HashTable is a trait without a factory method and thus cannot be instantiated. HashMap and HashSet are subclasses that you should use.

https://stackoverflow.com/questions/3648870/scala-using-hashmap-with-a-default-value

References¶

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-map/index.html#kotlin.collections.Map

1. LinkedHashMap preserves the insertion order (which is similar to dict in Python 3.7+).