Extension method for Enumerable.Intersperse?

Question

I learned the intersperse function from Haskell, and have been looking for an implementation in c#.

Intersperse takes 2 arguments, an IEnumerable source and

Answer 1

It would be pretty easy to write:

public static IEnumerable Intersperse(this IEnumerable source, T value) {
    bool first = true;
    foreach(T item in source) {
         if(first) { first = false; }
         else { yield return value; }
         yield return item;
    }
}