"A lot has been written about filters in the context of the user's journey, complex enterprise software, UI patterns, and UX patterns."
"Surprisingly, there's little to nothing written for designers about the logic of how filters work, outside the realm of engineering articles."
"If you don't understand the logic behind how filters affect results, your designs will be limited to just visuals, you'll be shifting a critical part of the user experience to engineers, and you won't be able to discuss tradeoffs if needed."
Filters select items from a set by showing or hiding elements that share attributes, enabling users to narrow results. Designers who lack filter logic knowledge produce interfaces focused only on visuals and push critical behavioral choices to engineers, reducing ability to evaluate tradeoffs. Filter behavior includes how criteria combine (AND/OR), precedence among rules, handling of exclusions, dependencies between facets, default and saved states, and feedback for empty or partial results. Filters introduce complexity with asynchronous data, large result sets, and hierarchical relationships. Testing and documenting expected behaviors prevents surprises and improves cross-disciplinary collaboration.
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