Group by key

Can someone walk me through how to use the Group by Key node in Dynamo 0.7.1? I am not sure what the key projector is. Just want to group a list into multiple lists of the same value.


The key projector is just a function that operates on the list to be sorted. Take, for example, a list of points, and I want to group them by they x-coordinate.


Also check out this thread:, which uses an alternate technique in the case where the logic you are grouping items by is not directly related to the items themselves.

got it. thanks!