secondValueIterator.js

function* customGenerator() {
  yield 1;
  yield 2;
  yield 3; 
}

let getIterator = customGenerator();

let firstValue = getIterator.next();

console.log(firstValue);  

// Output is: { value: 1, done: false}

let secondValue = getIterator.next();

console.log(secondValue);  

// Output is: { value: 2, done: false}