generator.js

// normal generator
function* gen() {
  yield 2;
  yield 3;
}
gen2 = function* () {}
a = gen()
for (b of a) {
  console.log(b)
}

// generator method
obj = { 
  * a(){
    yield 1;
    yield 2;
  }
};
a = obj.a()
for (b of a) {
  console.log(b)
}

// yield can iterate
a = function*() {
  var array = [1,2,3]
  yield* array
  yield* array
  yield* array
}()
for (b of a) {
  console.log(b)
}

// stop, throw (throw can be used in firefox34)
a = function*() {
  var array = [1,2,3]
  yield* array
  yield* array
  yield* array
}()
console.log(a.next())
a.throw(new Error('stop it'))
console.log(a.next())

// generator instance does not expose access to its generator function
console.log((new function *() {yield 1}).constructor) // => GeneratorFunctionPrototype