javascript - Composing generator producer of values -

how can compose producer generator gets values externally generator? if producer yields value within generator works, when send value next undefined. there way this?

function* producer() {     while (true) {         yield // want send values here     } }  function* take(n, gen) {     var = 0     (var x of gen) {         if (i <= n) {             yield x // want value sent producer             += 1         } else {             break         }     } }  var prod = producer() var res = take(5, prod)  // how can send values producer // , make result yield values?  res.next() // init console.log(res.next(1)) // {value: undefined, done: false} console.log(res.next(2)) // {value: undefined, done: false} // ...  // want // {value: 1, done: false} // {value: 2, done: false} // ... 

to value sent next(), should use result returned yield. not quite sure end goal is, here modified example:

let producer = function*() {     var nextresult = undefined;     while(true) {         nextresult = yield nextresult;         console.log("produce " + nextresult);     } }  let take = function*(number, items) {              var count = 0;     var item = undefined;     while (count <= number) {         items.next(item);         item = yield item;         console.log("take " + item);         count += 1;     } }  var res = take(2, producer())  res.next() // init console.log('result ' + res.next(3).value) console.log('result ' + res.next(2).value) 

this outputs:

take 3 produce 3 result 3 take 2 produce 2 result 2 

es6 fiddle link