asMap method Null safety

Map<int, E> asMap()

An unmodifiable Map view of this list.

The map uses the indices of this list as keys and the corresponding objects as values. The Map.keys Iterable iterates the indices of this list in numerical order.

var words = <String>['fee', 'fi', 'fo', 'fum'];
var map = words.asMap();  // {0: fee, 1: fi, 2: fo, 3: fum}
map.keys.toList(); // [0, 1, 2, 3]


Map<int, E> asMap();