>
>
>> ```js
>> let map2 = new Map(map1.entries().filter((key, value) => key >= 0));
>> let map2 = new Map(map1.entries().map((key, value) => [key * 2, value *
>> 2]));
>>
>> entries() returns an iterator, not an array.
>

let map2 = new Map([...map1].map(([k, v]) => [k, v * 2])
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>  entries() returns an iterator, not an array.

```js
let map2 = new Map([...map1].map(([k, v]) => [k, v * 2])
```