Javascript generator pipeline compose implementation

Hard

You're building a data processing pipeline using generators. What's the correct implementation to make this compose function work?

JavascriptGeneratorsIteratorsFunctional programmingComposition

1function* filterGen(predicate, iterator) {
2  for (const value of iterator) {
3    if (predicate(value)) {
4      yield value;
5    }
6  }
7}
8
9function* mapGen(transform, iterator) {
10  for (const value of iterator) {
11    yield transform(value);
12  }
13}
14
15// Missing implementation
16____________________
17____________________
18____________________
19____________________
20
21// Usage:
22const pipeline = compose([
23  iter => filterGen(x => x > 0, iter),
24  iter => mapGen(x => x * 2, iter),
25  iter => filterGen(x => x < 10, iter)
26]);
27
28const numbers = [1, -2, 3, -4, 5, 6];
29const result = [...pipeline(numbers)];
30// Should output: [2, 6]

You're building a data processing pipeline using generators. What's the correct implementation to make this compose function work?

Hint