is-empty for filters
Check for empty values.
Signature
> is-empty ...rest
Parameters
...rest: the names of the columns to check emptiness
Input/output types:
| input | output |
|---|---|
| any | bool |
Examples
Check if a string is empty
> '' | is-empty
true
Check if a list is empty
> [] | is-empty
true
Check if more than one column are empty
> [[meal size]; [arepa small] [taco '']] | is-empty meal size
false