[JS] Generator Args

With generator, you can call the yield like a tokken. Here is an example.

The returned yield object has value and done when the last yield then done will be true

function* gen() {
  yield "First Statement";
  yield "Second Statement";
  yield "Third Statement";
}

let generator = gen();

console.log(generator.next().value); // First
console.log(generator.next().value); // Second
console.log(generator.next().value); // Third
console.log(generator.next().value); // undefined
console.log(generator.next());
console.log(generator.next().done == true) // true

Another example

function* numGen(max) {
  let index = 0;
  while (index <= max) {
    yield index++;
  }
}

const generator2 = numGen(2);

console.log(generator2.next().value); // 0
console.log(generator2.next().value); // 1
console.log(generator2.next().value); // 2
console.log(generator2.next().value); // undefined
console.log(generator2.next().done); // true