# set.add_all · Rell standard library · Chromia Docs (concept)

> function add_ all(values: collection <-T>): boolean Add all elements from another collection to the end of this collection. If this collection does not all

Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/set/add_all/

FUNCTION

# set.add\_all

```signature
function add_all(values: collection<-T>): boolean
```

Add all elements from another collection to the end of this collection.

If this collection does not allow duplicates, then only those elements not already contained in this
collection are added.

**Parameters**

* **values** — the collection of elements to add

**Returns**

`true` if any elements were added to this collection, `false` if it was not modified

Since 0.9.0

[View this page on docs.chromia.com](https://docs.chromia.com/pages/rell-stdlib/-rell%20-system%20-library/%5Broot%5D/set/add_all.html)Generated API reference, mirrored from the live docs