> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/perl6-rosettacode/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/perl6-rosettacode/programming_tasks/f/filter.md).

# Filter

```perl
my @a = 1..6;
my @even = grep * %% 2, @a;
```

Alternatively:

```perl
my @a = 1..6;
my @even = @a.grep(* %% 2);
```

Destructive:

```perl
my @a = 1..6;
@a .= grep(* %% 2);
```