monoids
Recognize and apply the monoid abstraction (binary associative operation + neutral element) in TypeScript and Clojure/ClojureScript code. Use whenever the user is combining, aggregating, merging, or reducing data — shopping carts, permissions/roles, metrics and counters, event logs, config objects, or any reduce/fold/merge-with over a collection — even if they don't use the word "monoid". Also use when reviewing code that special-cases empty lists/collections, when discussing Map-Reduce or parallel aggregation (including pmap-based reduction), or when designing a generic combine/merge/empty API instead of ad hoc merge logic. Trigger this for "how do I merge these two X" or "what's a clean way to aggregate Y" style questions in either language, not just explicit monoid/algebra questions.
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