pack method
Converts list of elements to nested lists of elements
where each sub-list contains max packSize
items
Implementation
List<List<T>> pack(int packSize) {
final packsCount = (length / packSize).ceil();
final List<List<T>> result = List.generate(packsCount, (_) => <T>[]);
int currentPack = 0;
for (int i = 0; i < length; i++) {
result[currentPack].add(this[i]);
final num = i + 1;
if (num % packSize == 0) {
currentPack++;
}
}
return result;
}