Passing an argument to a generator function in example of generating IDs

idGeneration.js

export default function* idGeneration(start = 0) {
    while(true) {
        const newID = yield start++;
        if (typeof newID !== 'undefined') {
            start = newID;
            yield start++;
        }
    }
}

// Example of usage
// const idGenerator = idGeneration();
// console.log(idGenerator.next().value); // 0
// console.log(idGenerator.next().value); // 1
// console.log(idGenerator.next().value); // 2
// console.log(idGenerator.next(5).value); // 5
// console.log(idGenerator.next().value); // 6
// console.log(idGenerator.next().value); // 7
// console.log(idGenerator.next(100).value); // 100
// console.log(idGenerator.next().value); // 101