passingParametersToNext.js

function* customGenerator() {
    let x = yield 1;
    yield x + 1
}

let getIterator = customGenerator();

let nextValue = null;

nextValue = getIterator.next();
console.log(nextValue);  
// Output is: { value: 1, done: false }

nextValue = getIterator.next(10);
console.log(nextValue);  
// Output is: { value: 11, done: false }

nextValue = getIterator.next();
console.log(nextValue);  
// Output is: { value: undefined, done: true }