Shortcode int instead of string

Does somebody knows how can I have a int from a string for a shortcode experiment I’m running?

{{% book 2 %}}
{{ $a := .Get 0 }}

 {{  index ( index $csv 5 ) $a }} 

It should print $a as 2, but for some screwy reason it doesn’t.

error calling index: cannot index slice/array with type string

I need me an int from that string! The number can be as high as 500, so I can’t go the if/condditional way.

Oops, found out how to solve it.

{{ $col := int (.Get 0) }}

Results into passing it as a int!