A linqish way can be writing an extension method GroupWhile
like below (All checks omitted. not optimized to understand easily.)
int[] list = new int[] { 1, 2, 3, 5, 7, 8 };
var result = list.GroupWhile((x, y) => y - x == 1)
.Select(x => new {i = x.First(), len = x.Count() })
.ToList();
public static IEnumerable<IEnumerable<T>> GroupWhile<T>(this IEnumerable<T> seq, Func<T,T,bool> condition)
{
T prev = seq.First();
List<T> list = new List<T>() { prev };
foreach(T item in seq.Skip(1))
{
if(condition(prev,item)==false)
{
yield return list;
list = new List<T>();
}
list.Add(item);
prev = item;
}
yield return list;
}
TODO: use IGrouping
🙂