Spread operator

so `...` is the spread operation. So if you have:

```
const a = [9,8,7]
```

then `...a` is literally, `9,8,7` (without the `[`)

so then....

```
const a = [9,8,7]
console.log(...a) // you are calling this function with 3 arguments, 9,8,7
```

so...

```
const a= [9,8,7]
const b = [...a, {}]
```

What is happening here with `b` is `[9,8,7, {}]]`