intersperse<T> function
(arr: 1, 3, 4
, item: 0) yields: 1, 0, 3, 0, 4
Implementation
List<T> intersperse<T>(List<T> arr, T item) {
return arr.foldIndexed(<T>[], (int index, List<T> pv, T v) {
pv.add(v);
if (index < arr.length - 1) {
pv.add(item);
}
return pv;
});
}