Creates a new map and adds all entries.
Creates a new map like new Map<K, V>()
and then adds the key and value of eacy entry in entries
in iteration order.
factory Map.fromEntries(Iterable<MapEntry<K, V>> entries) => <K, V>{}..addEntries(entries);
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-core/Map/Map.fromEntries.html