What if N is larger than the list's length?

The pop count is capped at the list's length, so every item is popped and the remaining list comes back empty rather than erroring.

Can I see the items that were removed?

Yes, both outputs are shown: the remaining list and the popped items, so you can use either or both.

How is this different from List Truncator?

List Truncator only outputs the kept portion of the list; List Item Popper also gives you the removed portion as a separate output, which is useful when you need to keep track of what was taken off.

What's the opposite of popping?

List Item Pusher adds items to the front of a list, and List Item Appender adds them to the end, both are the inverse of removing items.

List Item Popper - Remove Last N Items from a List

Overview

Introduction

Removing the last few items from a list while keeping track of exactly what was removed is a common need when processing batches or trimming overflow entries.

List Item Popper removes the last N items from your list and returns both the shortened list and the popped-off items separately.

What Is List Item Popper?

This is a list-editing tool modeled on the classic "pop" operation from stacks and arrays, but extended to remove N items at once instead of just one.

It always produces two outputs: the remaining list (everything except the last N items) and the popped items (the last N items themselves), so no data is lost from view.

How List Item Popper Works

The input is split into items using the chosen separator, then the pop count is capped at the list's total length so it never goes negative.

`Array.prototype.slice()` splits the array at that boundary, giving the remaining items and the popped items as two separate arrays, each rejoined with the same separator.

When To Use List Item Popper

Use this when you need to trim a fixed number of items off the end of a list but still want to see or reuse what was removed.

It's useful for batch processing, take the last N items off a queue-like list, process them, and keep the shortened list for the next round.

Often used alongside List Item Pusher, List Item Appender and List Truncator.

Features

Advantages

Never silently discards data, the popped items are always shown alongside the remaining list.
Gracefully handles a pop count larger than the list by capping it rather than erroring.
Works with any separator style.

Limitations

Only removes from the end of the list; use a different tool if you need to remove from the start or middle.
Doesn't validate that popped items match any particular pattern, it's a purely positional operation.

Examples

Popping the last two items

Input

a, b, c, d (count: 2)

Output

Remaining: a, b — Popped: c, d

The last two items are separated out from the first two.

Popping more items than the list contains

Input

a, b (count: 5)

Output

Remaining: (empty) — Popped: a, b

The pop count is capped at the list's length of 2, so every item ends up in the popped output.

Best Practices & Notes

Best Practices

Use a pop count of 0 to sanity-check the tool's behavior without actually removing anything.
Pair with List Item Pusher if you're implementing a simple stack-like workflow, pop from the end here, push new items to the front there.

Developer Notes

Implemented as `items.slice(0, length - popCount)` for the remaining items and `items.slice(length - popCount)` for the popped items, with `popCount = Math.min(count, items.length)` to avoid a negative slice boundary.

List Item Popper Use Cases

Removing the most recent batch of entries from a running log-style list
Splitting off the last N items of a queue for separate processing
Trimming a list down to size while keeping a record of what was cut

Common Mistakes

Expecting an error when the pop count exceeds the list length; instead it's capped and the whole list is popped.
Forgetting to check the popped-items output when the removed items actually matter for later use.

Tips

If you only care about the remaining list and don't need the popped items, List Truncator (direction: start) does the same trim with a simpler single output.
Combine with List Item Pusher to simulate moving items from the end of one list to the front of another.

List Item Popper