returnGenerator.js

let fibonacciSequenceGenerator = makeFibonacciSequenceGenerator(50);

console.log(fibonacciSequenceGenerator.next().value); // 1
console.log(fibonacciSequenceGenerator.next(3).value); // 5
console.log(fibonacciSequenceGenerator.next().value);   // 8
console.log(fibonacciSequenceGenerator.return(374).value); // 374
console.log(fibonacciSequenceGenerator.next(1).value); // undefined