Web Reference: Sep 30, 2020 · You have to initialize a List and put the key and that initialized List into the HashMap before you can add any more items to the value of a key. In your example code nothing is put into the HashMap and nothing can be added. Jul 12, 2025 · In Kotlin, a HashMap is a collection that stores key-value pairs, where each key must be unique, but values can be duplicated. It is a hash table based implementation of the MutableMap interface. HashMap uses an internal data structure with a finite capacity - the maximum number of entries it can store before needing to grow. As entries are added, the map tracks its load factor, which is the ratio of the number of entries to the current capacity.
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