Lazy Pipeline with Iterators

lazy-pipe.js

function* itOne(it) {
  let current = it.next()
  while(current.done == false){
    console.log("ONE");
    yield current.value + 2;
    current = it.next();
  }
}

function* itTwo(it) {
  let current = it.next()
  while(current.done == false){
    console.log("TWO");
    yield current.value + 2;
    current = it.next();
  }
}

function* gen() {
  for(let i = 0; i < 5; i++){
    yield i + 1;
  }
}

const a = gen();
const b = itOne(a);
const c = itTwo(b);

for (const x of c) {
  console.log(x);
}