### Round number to n digits

Use `Math.round()` and template literals to round the number to the specified number of digits.
Omit the second argument, `decimals` to round to an integer.

```js
const round = (n, decimals=0) => Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);
// round(1.005, 2) -> 1.01
```