dfr value-counts for dataframe

Returns a dataframe with the counts for unique values in series.

Signature

> dfr value-counts

Examples

Calculates value counts

> [5 5 5 5 6 6] | dfr into-df | dfr value-counts
╭───┬───┬────────╮
│ # │ 0 │ counts │
├───┼───┼────────┤
│ 0 │ 5 │      4 │
│ 1 │ 6 │      2 │
╰───┴───┴────────╯