Linq query that reduces a subset of duplicates to a single value within a larger set?

Question

Is there a linq command that will filter out duplicates that appear in a sequence?

Example with '4':

Original { 1 2 3 4 4 4 5 6 7 4 4 4 8 9 4 4 4 }
Filtered { 1 2 3 4 5 6 7 4 8 9 4 }

Thanks.

Answer 1

Not really. I'd write this:

public static IEnumerable<T> RemoveDuplicates(this IEnumerable<T> sequence)
{
    bool init = false;
    T current = default(T);

    foreach (var x in sequence)
    {
        if (!init || !object.Equals(current, x))
            yield return x;

        current = x;
        init = true;
    }   
}