Returns a new map where all entries of this map are transformed by the given f
function.
Map<K2, V2> map<K2, V2>(MapEntry<K2, V2> f(K key, V value));
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-core/Map/Map.html