Slice List

Uncontrolled node

Overview

The Slice List node extracts a portion of an array (list) using start and end indices. It behaves like JavaScript's Array.prototype.slice() method, returning a shallow copy of the selected elements from the original list without modifying it.

The node is useful for pagination, batch processing, or extracting specific ranges of data from larger datasets.

Inputs

Input	Type	Description	Default
list	Data (Array)	The array to slice. If not an array or empty, returns an empty string.	-
start	Number	The zero-based index at which to begin extraction (inclusive). If omitted or invalid, defaults to 0.	0
end	Number	The zero-based index at which to end extraction (exclusive). If omitted or invalid, defaults to the length of the list.	list.length

Outputs

Output	Type	Description
output	Data (Array)	A new array containing the extracted elements from start (inclusive) to end (exclusive).

Runtime Behavior and Defaults

• Uncontrolled Operation: This node runs automatically when its inputs change; it does not require an event trigger.
• Index Handling:
  • If start is not a valid number, it defaults to 0.
  • If end is not a valid number, it defaults to the length of the input list.
  • Both indices are floored to integers (e.g., 1.7 becomes 1).
• Edge Cases:
  • If the input list is not an array or is empty, the output is an empty string.
  • If start is greater than end, the output is an empty array.
  • Negative indices are supported (e.g., -1 refers to the last element), following standard JavaScript slice behavior.
• Immutability: The original input list is not modified; a new array is returned.

Example

To extract the first three elements from a list of items:

1. Connect your list (e.g., [10, 20, 30, 40, 50]) to the list input.
2. Set start to 0 (or leave empty to default to 0).
3. Set end to 3.

The output will contain [10, 20, 30].

To get elements from index 2 to the end of the list:

• Set start to 2
• Leave end empty (defaults to list length)

For a list ["a", "b", "c", "d"], this returns ["c", "d"].