an iterator for the entry set
true if this map contains a mapping for the specified key.
an entry with the greatest key, or null if this map is empty
true if this map contains no key-value mappings
an entry with the greatest key, or null if this map is empty
the previous value associated with key, or undefined if there was no mapping for key. (An undefined return can also indicate that the map previously associated undefined with key.)
the number of key-value mappings in this map
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