> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/a/array_concatenation.md).

# Array concatenation

```ruby
var arr1 = [1, 2, 3];
var arr2 = [4, 5, 6];
var arr3 = (arr1 + arr2);   # => [1, 2, 3, 4, 5, 6]
```