I'm new to programming and I've just stumbled upon a problem that I don't fully understand yet. 
I've looked everywhere for similar problems and their resolution but 
but I don't see how I can fix this problem. 
So I'm asking for your help to know the best way to do this code without the spread operator and destructuring that are not functional in IE. 

Here the code I have and what i need to adapt to be functional on IE 11: 

```
computed: {
            quantityValues: function () {
                return [...Array(5).keys()].map(function (v) { return v + this.currentQuantity + 1; }.bind(this));
            }
        }

```

Thank you all in advance for your answers.