Problems with “keep”

I’m trying to make the opposite of the “keep” block but I can not get it to work

Outside of a custom block it works fine
But the second I make it into a custom block it doesn’t

I’ve tried a few things but I’ve concluded that I would need to know how the block works (what system is uses to get its results) to be able to fix it further

I created my own definition for the block but I’d prefer to use the “keep” block as that one is just simply more stable

Here is a solution:
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I always forgot about the change to the join block -_-
Why wouldnt run with inputs work tho

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This one allows for usage of (value, index, array).

What's wrong with the most obvious
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For a more general approach
I made a function that groups all items by result of a function applied to each item.
E.g. it can divide a list of numbers into a list of primes and one of non-primes:

... or multiple sublist, grouped by a number's smallest divisor:

This is the implementation code
It will determine the result of the function only once for each item, and no (relatively inefficient) CONTAINS operation is required.

Programming tools SANDBOX script pic (46)

I found a library block doing the same thing as my GROUP BY function (but slightly better); unsurprisingly it's called Programming tools SANDBOX script pic (50); it's in the Frequency Distribution Analysis library.

Very cool!
Unrelated note: I personally prefer “recall [] as (i)” rather than “let [] be (i)”

I think the word "let" describes what the block does pretty well. Check out MDN's description of the functionality of "let" in JavaScript.

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