Basic JS Generator

generators.js

//I typically use promise chains to handle
//sync control but today I'm playing around with generators. 
//View on Repl: https://repl.it/KWdA/1

function *myGen() {
  var one = yield 1;
  var two = yield 2;
  var three = yield 3;
  console.log(one, two, three);
}

const gen = myGen();

//first yielded value
console.log(gen.next());

//second yielded value
console.log(gen.next());

//third yielded value
console.log(gen.next());

//Runs console.log on line 5
//Now that generator has completed
//Value undefined because there are no more
//yielded values. Done = true
console.log(gen.next());



//console.log on line 5 returned all undefined values
//because no values were returned above. Let's
//fix that.

const gen2 = myGen();

console.log(gen2.next());
console.log(gen2.next(1));
console.log(gen2.next(2));
console.log(gen2.next(3));


//values given back to generator aren't
//required to be the same as values yielded

const gen3 = myGen();

console.log(gen3.next());
console.log(gen3.next('foo'));
console.log(gen3.next(false));
console.log(gen3.next({foo: 'bar'}));