Conditionally interspersing a seperator Hi :slight_smile: This is my first post here. I have a list of items that each have a date field. When redndering the list, its sorted by this date field, and now I would like to add a small header everytime the date changes. Example: 14th March 2024 It…

Hello and welcome to the forum. Enum.group_by is your friend here. Given this list of events you should then do this: events = [ %{name: "Item 1", date: ~D[2000-01-01]}, %{name: "Item 2", date: ~D[2000-01-01]}, %{name: "Item 3", date: ~D[2000-01-02]}, %{name: "Item 4", date: ~D[2000-01-03]…

You could use Enum.chunk_by : @streams.events |> Map.values() |> Enum.sort_by(& &1.date) |> Enum.chunk_by(& &1.date) |> Enum.map(fn chunk -> # here, chunk is a list of events that all have the same `date` value # you can get that date from hd(chunk).date end)

Can you hide all that Enum mapping/chunking/grouping in a function, passing in the stream, without breaking change tracking? Or does it have to happen in the template to keep change tracking happy?

Elixir Programming Language Forum

Conditionally interspersing a date seperator in a list

Questions & Help Questions

solop March 17, 2024, 6:55am 5

@al2o3cr @dimitarvp Beautiful, thanks!