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A bunch of lisps do that. Clojure for instance or arc use conventions like that to reduce the number of parentheses. See e.g. cond in clojure: https://clojured

• diggan 2y ago
  > Clojure for instance or arc use conventions like that to reduce the number of parentheses Clojure also reduces parentheses by introducing more characters for various data-structures (good and bad, many would say), like [] for vectors, which are for example used for arguments when defining functions (def add-five [a] (+ a 5))