Remove from List

Remove from List

Type: list-remove-at  ·  Package: Collections Activities v1.0.3  ·  Output: none

Removes the element at a specific position of the list. Indexes start at 0.

How it works

Removes from list the element at position index, modifying the list directly. The elements that came after it move up one position. If the index does not exist, it fails and the list does not change.

Required parameters

Parameter	Type	Default	Description
list	List	—	The list.
index	int	—	Position of the element to remove, counting from 0.

Optional parameters

None.

Output

This activity does not return a value; it modifies the list in place.

Common errors

Message	Cause and fix
Index … is out of range (list count: …).	The index is negative or does not exist. Use count(list) - 1 for the last element.
'list' must be a List, got ….	list is not a list (the message shows the type received, or null).

Example

Remove from List   list = names   index = 0     // removes the first one
List Count         list = names   → output: remaining

Careful when removing inside a loop

If you loop through a list and remove elements at the same time, indexes shift and you can skip elements. A safe alternative is to build a new list with only the ones you want to keep, or filter with LINQ: list.Where(x => ...).ToList().

Related activities

• Clear List — empty the whole list.
• Add to List — add elements.