what's a good name for a function that works like GroupBy except the group key selector returns an array of keys and the element is placed into each of those groups?
GroupByMany? DistributeBy? maybe LabelBy?
EDIT: MultiLabelBy is currently my preferred answer.
EDIT2: CategoriseBy has also been suggested and seems perhaps more intuitive. thoughts?
@tef the baseline behaviour is GroupBy:
https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.groupby?view=net-8.0
i.e. "get some property of each element and use it as a key by which to group all elements by".
now imagine that instead of keySelector just returning one key, it can return any number of keys, so an element can appear in multiple groups.
@tef MultiLabelBy has been suggested and I think I might go with that.
@tef CategoriseBy for the naming convention but yeah I also like that, and it feels more intuitive than MultiLabelBy...
