Adds value
to the end of this list, extending the length by one.
Throws an UnsupportedError if the list is fixed-length.
void add(E element) { this[this.length++] = element; }
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-collection/ListMixin/add.html