Removes the objects in the range start inclusive to end exclusive.
The start and end indices must be in the range
0 ≤ index ≤ length, and start ≤ end.
Throws an UnsupportedError if this is a fixed-length list. In that case
the list is not modified.
Source
void removeRange(int start, int end) {
_checkRange(start, end);
callMethod('splice', [start, end - start]);
}