addEntries method

void addEntries (Iterable<MapEntry<K, V>> entries)
override

Adds all key/value pairs of newEntries to this map.

If a key of newEntries is already in this map, the corresponding value is overwritten.

The operation is equivalent to doing this[entry.key] = entry.value for each MapEntry of the iterable.

Implementation 

void addEntries(Iterable<MapEntry<K, V>> entries) =>
    _base.addEntries(entries.map(
        (e) => new MapEntry(_canonicalize(e.key), new Pair(e.key, e.value))));