Issue type:

• ➕ Feature request

Short description:

This may be kind of a confusing request at first, but the chat I had over at the discord server may clarify why this could be useful.

Use example; from what I originally intended to do before I found out I couldn't:

Use an inventory reader on a variable store
Return a list of all cards
Map them to this new operator and return a list of all their values
You may now have a dynamically assembled list from tons of readers
You can then map them all to whatever you may need. Removing or adding a card to the store automatically updates the list and the resulting maps.

Related to #525

Thumbs up to this feature request; it would allow pretty powerful meta-programming.
Part and card IDs are powerful but inaccessible to the users unfortunately.

A possible way of implementing this feature would be by creating a rather simple operator:
Get Card Value :: Integer -> Any
Parameter is card id, result is whatever is stored in the card.
The operator can then be used in a few ways - for example, create a lazy list of integers, store a bunch of cards from readers into a store, then map the list via this operator, then do whatever is necessary. (Discord link: https://discordapp.com/channels/386052815128100865/386054223688630272/705551702761275463 )

Yet another nice thing might be taking this one step further and allow the same kind of operations but with the readers themselves:
Get aspect :: Integer -> String -> Any
Parameters are: part ID, aspect name, result is whatever is produced by that reader.
This would even eliminate the necessity for cards if you have a large self-repeating structure with consecutive part IDs!

Discord

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I immediately imagined something to the effect of map(getCardValue, $VARIABLESTORE->contents()) or $VARIABLESTORE->slot(SlotNr)->callCardFunction($VARIABLESTORE_B->slot(slotNr_b)).

Put a named variable store next to your machine, put in all the item cards you want it to process, put the resulting list into an item exporter.

Maybe less useful?: $NETWORK.getCardWithID($VARIABLESTORE.slot(42).getCardID + 23).getCardValue() - 63