Hi OGs, How can I delete the 1st pair in a map ? Thank you

Final and conclusive solution; always deleting the 1st pair: new_map = %{“name” => “foo”, “address”=> “bar”} |> Enum.into(%{}, fn {“name”, v} -> {“1st”, v} other -> other end) |> Map.drop([“1st”]) ps. try this at home but never at work.

[image] msimonborg: in Elixir small maps (<= 32 elements) automatically sort the keys by Erlang term order, while large maps (> 32 elements) do not At the moment of writing it’s true but one should not rely on it. So we may as well forget it as it’s an implementation detail that might change. …

[image] BartOtten: |> Enum.map(fn {“name”, v} -> {“1st”, v} other -> other end) |> Map.drop([“1st”]) If it wasn’t piping a list into a Map function this would be the definitive way to drop the 1st pair of a map :joy:

If performance is a concern and we don’t want to create a full map from scratch, maybe we could do something like (disclaimer: I didn’t benchmark): {first_key, _, _} = map |> :maps.iterator() |> :maps.next() Map.delete(map, first_key) (“first_key” in the sense of whatever keys comes out first …

If you want the internet to respont, make an error - Elvis Presley :sweat_smile: ps. quoting the brilliant and definitive answer, rewriting it using Enum.map/2 so you can say it’s wrong… it is Lousy. Jea Lousy. How would you feel if you liked a post and the author edited it and blamed you for somet…

[image] BartOtten: If you want the internet to respont, make an error - Elvis Presley *respond

Haha! Perhaps Elvis only left the building 'cos it had rubbish internet?

The proof was in the statement indeed. Suprised it took 2 hours :joy:

@sodapopcan They are duplicated entries from database so they’re pretty much the same except some properties are different so I can delete them based on logic If some “that” properties are the same then… I wanted to extract the first out, then delete the rest. I should have meant that in the begi…