Insert an element between each element of an Iterable or List.
final list1 = intersperse(2, <int>[]); // [];
final list2 = intersperse(2, [0]); // [0];
final list3 = intersperse(2, [0, 0]); // [0, 2, 0];
final list1Outer = intersperseOuter(2, <int>[]); // [];
final list2Outer = intersperseOuter(2, [0]); // [2, 0, 2];
final list3Outer = intersperseOuter(2, [0, 0]); // [2, 0, 2, 0, 2];
This can also be used as an extension method:
final list1 = <int>[].intersperse(2); // [];
final list2 = [0].intersperse(2); // [0];
final list3 = [0, 0].intersperse(2); // [0, 2, 0];
final list1Outer = <int>[].intersperseOuter(2); // [];
final list2Outer = [0].intersperseOuter(2); // [2, 0, 2];
final list3Outer = [0, 0].intersperseOuter(2); // [2, 0, 2, 0, 2];
