List<E> sublist(int start, [ int end ])

Returns a new list containing the objects from start inclusive to end exclusive.

List<String> colors = ['red', 'green', 'blue', 'orange', 'pink'];
colors.sublist(1, 3); // ['green', 'blue']

If end is omitted, the length of this is used.

colors.sublist(1);  // ['green', 'blue', 'orange', 'pink']

An error occurs if start is outside the range 0 .. length or if end is outside the range start .. length.

Source 

List<E> sublist(int start, [int end]) {
  int listLength = this.length;
  if (end == null) end = listLength;
  RangeError.checkValidRange(start, end, listLength);
  int length = end - start;
  List<E> result = new List<E>()..length = length;
  for (int i = 0; i < length; i++) {
    result[i] = this[start + i];
  }
  return result;
}