# Scripting Function - Boolean Function "empty/not empty"
**URL:** https://community.mp3tag.de/t/scripting-function-boolean-function-empty-not-empty/65555
**Category:** Support
**Created:** [August 11, 2024, 5:45am UTC](https://community.mp3tag.de/t/scripting-function-boolean-function-empty-not-empty/65555 "2024-08-11T05:45:40Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@rojaljelly](https://community.mp3tag.de/u/rojaljelly)
#### Post date: [August 11, 2024, 5:45am UTC](https://community.mp3tag.de/t/scripting-function-boolean-function-empty-not-empty/65555/1 "2024-08-11T05:45:40Z")
Is there a better/more simple way for adding a "not empty" dependicie into a format string than my solution:
$if($grtr($len(%track%,0),$num(%track%,1),)
This format string should unify the track numbers by removing leading zeros, but only if the track number is not empty (because it will lead to a "0" entry in the track number). If track number tag is empty, keep it empty.
So I'm checking if the length of the track tag is greater than 0 and then formating if true and nothing if empty.
---
### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [August 11, 2024, 6:02am UTC](https://community.mp3tag.de/t/scripting-function-boolean-function-empty-not-empty/65555/2 "2024-08-11T06:02:40Z")
You could try
`$if2($num(%track%,1),)`
---
### Author:  [@rojaljelly](https://community.mp3tag.de/u/rojaljelly)
#### Post date: [August 11, 2024, 6:19am UTC](https://community.mp3tag.de/t/scripting-function-boolean-function-empty-not-empty/65555/3 "2024-08-11T06:19:10Z")
> [@ohrenkino](#):
>
> $if2($num(%track%,1),)
This is working perfectly fine, but to be honest I don't understand the logic behind, according to the documentation.
`$if2(x,y)` ... if x is true, x is returned, otherwise y.
In this case x would be "number with 1 digit - so no leading zero)".
How can it be that this is "true" if the tag is for example "02" at the moment. This is confusing me.
---
### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [August 11, 2024, 6:43am UTC](https://community.mp3tag.de/t/scripting-function-boolean-function-empty-not-empty/65555/4 "2024-08-11T06:43:39Z")
AFAIK the $if2() function does that what you requested: check if the addressed field is there.
You find something similar with the `[]` in format strings which only return a result if the addressed field is there.
---
### Author:  [@rojaljelly](https://community.mp3tag.de/u/rojaljelly)
#### Post date: [August 11, 2024, 6:51am UTC](https://community.mp3tag.de/t/scripting-function-boolean-function-empty-not-empty/65555/5 "2024-08-11T06:51:14Z")
Thank you very much for your help and explanation!
My code wasn't working all the time, so I'm glad that there is a sleek function that really works.
Maybe the documentation of this function can be changed/expanded.
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [September 10, 2024, 6:51am UTC](https://community.mp3tag.de/t/scripting-function-boolean-function-empty-not-empty/65555/6 "2024-09-10T06:51:42Z")
This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.