Removes all objects from this list; the length of the list becomes zero.
Throws an UnsupportedError, and retains all objects, if this is a fixed-length list.
void clear();
© 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/List/clear.html