Eliminate consecutive duplicates of list elements

Question

Is there a \"nice\" way to eliminate consecutive duplicates of list elements?

Example:

[\"red\"; \"red\"; \"blue\"; \"green         


        

Answer 1

You can do it in LINQ:

list.Aggregate(new List(), 
   (current, next) => {
      if (current.Length <= 0 || current[current.Length-1] != next) current.Add(next);
      return current;
   });

Essentially, this creates an initially-empty list, runs through the entire source list, and only add an item to the target list if it is not the same as the last item of the target list.

You can just as easily (probably easier) do it without LINQ:

var target = new List();
foreach (var item in list) {
   if (target.Length <= 0 || target[target.Length-1] != item) target.Add(item);
}