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Generators in Javascript

Alexander

I was going through an article about generators. Stumbled upon this

function* gen() {
  let result = yield "2 + 2 = ?"; // (*)

  alert(result);
}

let generator = gen();

let question = generator.next().value;

generator.next(4);

In above code why it doesn't alert "2 + 2 = ?" in the function? and how is it waiting for the result to be passed and alerting that ??