Yield* Example

yieldStar.js

function* generatorDelegate () {
  var name = 'generatorDelegate';
  yield `${name}: 1`;
  yield `${name}: 2`;
  yield `${name}: 3`;
}

function* generator () {
  var name = 'generator';
  yield `${name}: 1`;
  yield* generatorDelegate();
  yield `${name}: 2`;
}

for (var y of generator()) {
  console.log(y);
}

/*
  generator: 1
  generatorDelegate: 1
  generatorDelegate: 2
  generatorDelegate: 3
  generator: 2
*/