py-in-the-sky

// Works in Chrome devtools console
function* downToZero (n) { 
    yield n;  // yield "first" element of the "list"

    if (n > 0)  // yield each element of the "rest" of the "list"
        for (var n2 of downToZero(n - 1)) 
            yield n2; 
}

var tenToZero = downToZero(10);