void replaceRange(
int start,
int end,
Iterable<Map> iterable
)

Removes the objects in the range start inclusive to end exclusive and inserts the contents of replacement in its place.

List<int> list = 1, 2, 3, 4, 5; list.replaceRange(1, 4, 6, 7); list.join(', '); // '1, 6, 7, 5'

An error occurs if start..end is not a valid range for this.

This method does not work on fixed-length lists, even when replacement has the same number of elements as the replaced range. In that case use setRange instead.

Source

void replaceRange(int start, int end, Iterable<E> iterable) {
  throw new UnsupportedError("Cannot modify an immutable List.");
}