generators_yield_on_yield.js

//script type="application/javascript;version=1.7"
function GenMaker() {
  let(j=1){for(;;) {yield (yield 'Hola '+j);j++}}
}

var gen = GenMaker();
console.log(gen.next()+', the deep yield give-out Hola and give-in undefined');
console.log(gen.next()+', now shallow yield return that undefined');
console.log(gen.next()+', now the deep yield: Hola out, undefined in');
console.log(gen.next()+', now the shallow yield: undefined');
console.log(gen.next()+', now the deep yield: Hola out, undefined in');
console.log(gen.next()+', now the shallow yield: undefined');
console.log(gen.next()+', now the deep yield: Hola out, undefined in');
console.log(gen.next()+', now the shallow yield: undefined');


/**

Pythonic behavior
-----------------

Hola 1, the deep yield give-out Hola and give-in undefined
undefined, now shallow yield return that undefined
Hola 2, now the deep yield: Hola out, undefined in
undefined, now the shallow yield: undefined
Hola 3, now the deep yield: Hola out, undefined in
undefined, now the shallow yield: undefined
Hola 4, now the deep yield: Hola out, undefined in
undefined, now the shallow yield: undefined

*/