insertEvery<T> method
Implementation
List<T> insertEvery<T>(T Function(T item) builder, {T? header, T? footer}) {
final list = this
.expand((item) sync* {
final newItem = builder(item);
if (newItem != null) {
yield newItem;
}
yield item;
})
.skip(1)
.toList()
.cast<T>();
if (header != null) {
list.insert(0, header);
}
if (footer != null) {
list.add(footer);
}
return list;
}