Simple javascript generator. It is not iterable through for of.

simpleGenerator.js

export default function generator() {
    const valuesToReturn = generator.prototype.valuesToReturn;

    return {
        value: null,
        done: null,
        next() {
            const returnThis = valuesToReturn.pop();
            return {
                value: returnThis,
                done: valuesToReturn.length === 0,
                next: this.next
            }
        }   
    }
}

// Example of usage
// generator.prototype.valuesToReturn = [
//     'abc',
//     'cdf',
//     'hello'
// ];

// var gen = generator();

// console.log(gen.next().value); // 0
// console.log(gen.next().value); // 1
// console.log(gen.next().value); // 2
// console.log(gen.next().value); // undefined