```
[[{ id: 26, type: "Source", name: "Email" }], [{ id: 27, type: "Source", name: "Id" }, { id: 29, type: "Divider", name: "+" }, { id: 30, type: "Source", name: "SupplierId" }], [{ id: 28, type: "Source", name: "CommunityId" }]

```

How do I convert this array of array of object above to an array of arrays like this where the "name" is singled out?

```
[["Email"],["Id","+", "SupplierId"],["CommunityId"]]

```

I have already tried to map it like this:

```
this.exportColumns = columns.flatMap(obj => obj.sourceColumn).map(obj => obj?.name);

```

but I get this outcome:

```
[ "Email", "Id", "+", "SupplierId", "CommunityId" ]

```