Recursive Generator Javascript

Question

The for loop is not returning the increasing count variable.

It acts as though the range function is not being called, but it is.

function* range (limit, count = 0) {
  if (count >= limit) return
  yield count
  range(limit, count + 1) 
} 


for (let i of range(16)) {
  console.log(i)
}

Does this answer your question? How do I return from a recursive generator function in JavaScript? — Anurag Srivastava
– Anurag Srivastava, Commented Apr 21, 2020 at 16:06

Brett East · Accepted Answer · 2020-04-21 16:13:55Z

4

You need to yield * the range from your generator function.

Give this a try:

function* range (limit, count = 0) {
  if (count >= limit) return
  yield count
  yield * range(limit, count + 1) 
} 


for (let i of range(16)) {
  console.log(i)
}

Because it's recursive you need to yield the result back up to the parent basically.

answered Apr 21, 2020 at 16:13

Brett East

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