isSortedBy method
Checks if the elements of this slice are sorted using the given comparator function.
Implementation
bool isSortedBy(Comparator<T> compare) {
for (var i = _start; i < _end - 1; i++) {
if (compare(_list[i], _list[i + 1]) > 0) {
return false;
}
}
return true;
}