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edited Dec 31, 2023 at 12:45

There is TallyBy in the WFR. The third argument you can put Identity to get all of them. See also:

ResourceFunction["TallyBy"][{{1, 1}, {1, 2}, {1, 2, 3}, {2, 3}}, First, Identity] // MapApply[Prepend]
{{3,{1,1},{1,2},{1,2,3}},{1,{2,3}}}

Note sure if the examples.count and the items should be on the same level, I have a feeling you might have meant:

ResourceFunction["TallyBy"][{{1, 1}, {1, 2}, {1, 2, 3}, {2, 3}}, First, Identity] // Map[Reverse]
{{3,{{1,1},{1,2},{1,2,3}}},{1,{{2,3}}}}

There is TallyBy in the WFR. The third argument you can put Identity to get all of them. See also the examples.

There is TallyBy in the WFR. The third argument you can put Identity to get all of them:

ResourceFunction["TallyBy"][{{1, 1}, {1, 2}, {1, 2, 3}, {2, 3}}, First, Identity] // MapApply[Prepend]
{{3,{1,1},{1,2},{1,2,3}},{1,{2,3}}}

Note sure if the count and the items should be on the same level, I have a feeling you might have meant:

ResourceFunction["TallyBy"][{{1, 1}, {1, 2}, {1, 2, 3}, {2, 3}}, First, Identity] // Map[Reverse]
{{3,{{1,1},{1,2},{1,2,3}}},{1,{{2,3}}}}

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created Dec 28, 2023 at 2:41

There is TallyBy in the WFR. The third argument you can put Identity to get all of them. See also the examples.