default for filters> default {flags} (default value) (column name)
default value: the value to use as a defaultcolumn name: the name of the column| input | output | 
|---|---|
| any | any | 
Give a default 'target' column to all file entries
>ls-la|default'nothing'target
Get the env value of MY_ENV with a default value 'abc' if not present
>$env|get-iMY_ENV|default'abc'
Replace the null value in a list
> [1, 2, null, 4] |default3
╭───┬───╮
│0│1│
│1│2│
│2│3│
│3│4│
╰───┴───╯
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