retainWhere method
Removes all elements not matched by test from the queue.
The test function must not throw or modify the queue.
Implementation
void retainWhere(bool test(E element)) {
_filter(test, false);
}Removes all elements not matched by test from the queue.
The test function must not throw or modify the queue.
void retainWhere(bool test(E element)) {
_filter(test, false);
}