Use splats 

You can use splats (copied from http://coffeescript.org/) in ES6 - so 

```
var myFun = function (
// create new args array
    const args = new Array(arguments.length);

    // inserts arguments inside
    Object.keys(arguments).forEach((key, index) => args[index] = arguments[key]);
}
```

simply becomes 

```
var myFun = function (...args) {}
```

and no comments are needed :-)
