The Koka Programming Language

// A generator effect with one operation effect yield<a> fun yield( x : a ) : () // Traverse a list and yield the elements fun traverse( xs : list<a> ) : yield<a> () match xs Cons(x,xx) -> { yield(x); traverse(xx) } Nil -> () fun main() : console () with fun yield(i : int) println("yielded " ++ i.show) [1,2,3].traverse // A generator effect with one operation effectindex/yield: (V, E, V) -> V yiel

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“A Functional Language with Effect Types and Handlers”