bool test(E element)
) Remove all elements not matched by test
.
This method is inefficient since it works by repeatedly removing single elements, each of which can take linear time.
Source
/**
* Remove all elements not matched by [test].
*
* This method is inefficient since it works by repeatedly removing single
* elements, each of which can take linear time.
*/
void retainWhere(bool test(E element)) {
_filterWhere(test, false);
}