addAll method
Adds the values
to the tree.
If supplied, compare
is used to compare an element from
values
with a value already present in the tree.
compare
must be consistent with the ordering of values already
present in this tree, but it may supply a more efficient implementation
of the comparison operation for this very invocation of addAll.
Implementation
void addAll(Iterable<T>? values, {int compare(T v1, T v2)?: null}) {
if (values == null) return;
values.forEach((s) => add(s, compare: compare));
}