[Javascript] Nested generators

To see how to call another generator inside a generator:

function* numbers () {
  yield ;
  yield ;
  yield* moreNumbers();
  yield ;
  yield ;
  yield ;
}

function* moreNumbers () {
  yield ;
  yield ;
  yield ;
}

const generator = numbers();
const values = [];

for (let val of generator) {
  values.push(val);
}

console.log(values); // [1,2,3,4,5,6,7,8]

Example:

class Tree {
  constructor (value, children= []) {
    this.value = value;
    this.children = children;
  }

  *printValues () {
    yield this.value;
    for (let child of this.children) {
      yield* child.printValues();
    }
  }
}

const tree = new Tree(, [
  new Tree(, [new Tree()]),
  new Tree()
]);

const values = [];
for (let value of tree.printValues()) {
  values.push(value)
}

console.log(values) // [1,2,4,3]