defun

Enables writing multiple function clauses that match argument patterns directly, reducing boilerplate from if or cond statements, as shown in the say-hi example.

Leverages Clojure's core.match to support literals, sequences, vectors, maps, and more, allowing complex matching logic, demonstrated in test examples.

Makes recursive functions intuitive with pattern-matched base cases, such as in count-down and accum, eliminating manual condition checks.

Supports private functions with defun-, anonymous functions with fun, and local functions with letfun, mirroring Clojure's standard constructs for versatility.