Len

Len expects no arguments and can be used on lists or objects. It returns the number of elements contained within the list/map.
Examples
$ echo '{"numbers":[1,2,3,4,5,6,7,8,9]}' | dasel -r json 'len()'
1
​
$ echo '{"numbers":[1,2,3,4,5,6,7,8,9]}' | dasel -r json 'numbers.len()'
9

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