Obvious benefits of generator

generator_into.js

// Generator, doing async without promise looking like sync...

function* countWithGenerator(n){
  for (var x = 0; x < n; x++) {
    yield x
    console.log('fetched!')
  }
}

function countInteratively(n){
  var res = []
  for (var x = 0; x < n; x++) {
    res.push(x)
    console.log('fetched!')
  }
  return res
}

console.log('==== counting with generator ====')
for (var x of countWithGenerator(5)) {
  console.log(x)
}
console.log('\n\n\n')

console.log('==== counting with iterator ====')
for (var x of countInteratively(5)) {
  console.log(x)
}