HashMap<K, V>.fromEntries constructor

HashMap<K, V>.fromEntries(Iterable<MapEntry<K, V>> entries)

Creates a HashMap containing the entries of entries.

Returns a new HashMap<K, V> where all entries of entries have been added in iteration order.

If multiple entries have the same key, later occurrences overwrite the earlier ones.

Implementation 

factory HashMap.fromEntries(Iterable<MapEntry<K, V>> entries) =>
    HashMap<K, V>()..addEntries(entries);