cond

macrosince v0.0-927imported clojure.core/condEdit
(cond & clauses)

Details:

clauses must be an even number of forms, ie: (cond t1 e1, t2 e2, t3 e3). Each test t is evaluated one at a time. If a test returns logical true, cond evaluates and returns the corresponding expression e and does not evaluate any of the other tests or expressions.

It is idiomatic to provide a default case as the last test pair using the keyword :else (a keyword always evaluates to logical true).

(cond) returns nil.


Examples:

(def a 42)
(cond
  (< a 10) "a is less than 10"
  (= a 10) "a is 10"
  (> a 10) "a is bigger than 10"
  :else "a is not a number!")
;;=> "a is bigger than 10"

See Also:


Source docstring:
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.
Source code @ clojure:src/clj/clojure/core.clj
(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))))))