asMap method Null safety
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 = ['fee', 'fi', 'fo', 'fum'];
var map = words.asMap(); // {0: fee, 1: fi, 2: fo, 3: fum}
map.keys.toList(); // [0, 1, 2, 3]
Implementation
Map<int, E> asMap();