Deep index of a nested list

[cymplecy]

I'm wanting to return an index (I like to think of it being a pointer) to an item in a nested list

But, I wondering, has this already been done?

Using this example structure:

what I'm looking for is returning something like

[cornelios207]

Here's what I did a while ago. Do these work for you?
Blocks

[cymplecy]

(Used wrong images in previous post!)
path is exactly what I was after

but I was expecting this to just return E

[cornelios207]

Oh, thats a variadic input slot! I thought It would make it easier to directly type the numbers in if you need to, otherwise you have to drop the list on top of the arrows

[cymplecy]

aah - got you

edit you must have a better mouse than me to drop a list onto those arrows !!!

[cornelios207]

Hah no, I had the same problem. Collapsing all the slots first did the trick for me but I guess I will just make it a list input :]

[cymplecy]

That will probaby what'll I use...

but...

I decided to try putting path at the end (so it would be easier to drop onto the arrows and keep) and changing syntax but everytime I try to do this - I end up with an error

Are you able to make it work this way
e.g in list find path

[cornelios207]

Like this?:

Its a recursive function, so when you change the order of the inputs slots you'll also have to change the inputs when it calls itself. Hope it helps!
Edit: this indeed makes it easier, thanks

[cymplecy]

@cornelios207

Its a recursive function, so when you change the order of the inputs slots you'll also have to change the inputs when it calls itself

Of course! Silly me!

Perfect

[cymplecy]

I've been having a play around, as I decided I was conflicted with the
in [] find input list []
syntax as that could imply that the block searches for the 2nd list within the first one

But I had this idea - turn it into a two liner and add some extra description

which I think makes it explicit that its not like the native item () of []

It's then no problem to drop a path list onto it

[cymplecy]

I've been trying out lots of stuff (but recursion is my weak point in computing) in attempting to get ALL the indices of a search item in a deep list.

I managed to get all the indices of a search item in a simple list

[update] 14Sep2022 finally managed to produce one that works without using a kludge

[update2 14Sep2022 - mm - not quite there yet - doesn't find the 3rd A

[update 15Sep2022 - I think (I know I've said it before!) that this one will find all indices wherever they appear in a list

Works on the previous test case and all others I've tried it