Generators / yield (es2015) and Async / await (es7) difference

Generators / yield (es2015) and Async / await (es7)

function* foo () {  
  var index = 0;
  while (index < 2) {
    yield index++;
  }
}
var bar =  foo();

console.log(bar.next());    // { value: 0, done: false }  
console.log(bar.next());    // { value: 1, done: false }  
console.log(bar.next());    // { value: undefined, done: true }  

co(function* (){  
  yield Something.save();
}).then(function() {
  // success
})
.catch(function(err) {
  //error handling
});


async function save(Something) {  
  try {
    await Something.save()
  } catch (ex) {
    //error handling
  }
  console.log('success');
}

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