Filter list method

The filter method is used to filter a list and return another list with the filtered values.

The method takes a single argument that is the function to filter the item. The format is <list>.filter($<name> <filter_with_$name>).

For example:

findit  -w 'files.filter($dir $dir.IS DIR).length() > 3'

will show only the directories that have more than 3 sub directories