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What this line means?

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#1

val res: MutableMap<String, MutableList<String>> = HashMap()

Thank you

Course: Decode the Coding Interview in Kotlin: Real-World Examples - Learn Interactively
Lesson: Feature #1: Group Similar Titles - Decode the Coding Interview in Kotlin: Real-World Examples

#2

Hi @Ego,
MutableMap is actually a hash map that holds the object in the form of key and value pair.
In this example
key = String
value = list of Strings

Let me know if it is not clear.
thank you