method
replaceRange

void replaceRange(
int start,
int end,
Iterable<E> 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.