_.without

_.without is the "get these out of here" node. It returns a copy of an array with every instance of the values you name removed. Prompt tags you never want to ship? Filenames that shouldn't reach the saver? Give _.without the list and a blacklist, and it hands back a clean copy.

It's a member of the auto-generated ovum/underscore family in comfy-ovum, sfinktah's grab-bag pack. Family disclaimer, stated plainly in the README: the underscore nodes are "an absolute disaster to use in production," WIP, not recommended for live workflows. _.without is a low-risk one - it makes a copy, so it won't mutate your source list - but the generic * inputs mean you should double-check what you're feeding it.

How it works

Underscore semantics: scan the input array, drop any element that equals one of the given values, keep everything else in order, return a new list. It doesn't touch the original. The node wraps underscore3, the vendored Python port of Underscore.js, in the standard generated shell - same chain behavior as its siblings: pass a _.CHAIN to continue a pipeline, pass a plain list to get the result directly.

Inputs and output

• py_list - the array to filter (type *, optional; also accepts a _.CHAIN).
• values - the values to remove. Like other vararg inputs in this family, the tooltip tells you to provide multiple values as a JSON array: ["low quality", "blurry"]. A single string is a single value, not a comma list - that's the classic gotcha here.
• Output: LIST.

Install

Manager: search comfy-ovum, install, restart. Or:

cd ComfyUI/custom_nodes
git clone https://github.com/sfinktah/comfy-ovum

Restart. No model downloads; underscore3 ships inside the repo, so nothing extra to install.

When it's the right tool

Any time you're assembling a tag list from multiple sources and want to enforce a small blacklist - drop the negative prompt tags that snuck into a positive, filter out a couple of file paths before a batch op, remove a known-bad seed from a list. For anything more structured (matching on keys rather than whole values), _.where is the better fit. And remember: it's a copy-returning filter, so your upstream list stays intact for anything else that reads it.