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Count unique

fast step  math

Counts the number of unique elements in each list/array of the input column.


The following are the step's expected inputs and outputs and their specific types.

Step signature
count_unique(input: list) -> (output: number)

where the object {"param": value} is optional in most cases and if present may contain any of the parameters described in the corresponding section below.


This step has no configuration parameters, so it's simply:

Example call (in recipe editor)
count_unique(ds.input_lists) -> (ds.n_unique)


input: column:list

A column containing lists.


output: column:number

The count of unique elements for each input list.