converter promessa para o gerador JS
function* count(){
for (var x = 0; true; x++) {
yield x
}
}
for (var x of count()) {
console.log(x)
}
Glamorous Grasshopper
function* count(){
for (var x = 0; true; x++) {
yield x
}
}
for (var x of count()) {
console.log(x)
}function count(n){
var res = []
for (var x = 0; x < n; x++) {
res.push(x)
}
return res
}
for (var x of count(5)) {
console.log(x)
}