cond(clojure.core)

Macro

Takes a set of test/expr pairs. It evaluates each test one at a time. If a test returns logical true, cond evaluates and returns the value of the corresponding expr and doesn't evaluate any of the other tests or exprs. (cond) returns nil.

; clojure/core.clj:364
(defmacro cond
  [& clauses]
    (when clauses
      (list 'if (first clauses)
            (if (next clauses)
                (second clauses)
                (throw (IllegalArgumentException.
                         "cond requires an even number of forms")))
            (cons 'clojure.core/cond (next (next clauses))))))

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