ComfyUI Node: Merge List

Merge List:

The ListMerge node is designed to combine two lists into a single list, providing a simple yet powerful way to aggregate data. This node is particularly useful when you need to consolidate multiple lists of elements, such as strings or other data types, into one unified list. By using this node, you can streamline your data processing workflow, making it easier to manage and manipulate large sets of data. The ListMerge node is flexible, allowing you to merge lists even if the second list is optional, thus providing versatility in various scenarios.

Merge List Input Parameters:

list_a

list_a is the primary list that you want to merge. This parameter is required and must be provided for the node to function. It represents the first set of elements that will be included in the final merged list. The elements in list_a can be of any type, and this list serves as the base to which the optional second list will be appended.

list_b

list_b is an optional list that can be merged with list_a. If provided, the elements of list_b will be appended to list_a to form the final merged list. This parameter is not mandatory, allowing you to use the node even when you only have one list to work with. The elements in list_b should be of the same type as those in list_a to ensure consistency in the merged list.

Merge List Output Parameters:

LIST

The output of the ListMerge node is a single merged list that contains all the elements from list_a followed by all the elements from list_b (if provided). This combined list allows you to work with a unified set of data, making subsequent data processing tasks more straightforward and efficient.

Merge List Usage Tips:

• Ensure that the elements in list_a and list_b are of the same type to avoid inconsistencies in the merged list.
• Use the ListMerge node to consolidate data from multiple sources before performing operations that require a single list input.
• If you only have one list to work with, you can still use the ListMerge node by providing only list_a and leaving list_b empty.

Merge List Common Errors and Solutions:

TypeError: 'NoneType' object is not iterable

• Explanation: This error occurs when list_b is not provided and the node attempts to iterate over a None value.
• Solution: Ensure that list_b is either provided or handled properly within the node to avoid attempting to iterate over a None value.

TypeError: can only concatenate list (not "NoneType") to list

• Explanation: This error occurs when the node tries to concatenate list_a with list_b and list_b is None.
• Solution: Make sure to check if list_b is None before attempting to concatenate it with list_a. If list_b is optional, handle the concatenation accordingly.