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doc source examples comments

1.3.0

if-not

clojure.core

(if-not test then)
(if-not test then else)

Evaluates test. If logical false, evaluates and returns then expr,
otherwise else expr, if supplied, else nil.

3 Examples top

link | changes
```
user=> (defn has-neg [coll] 
  (if-not (empty? coll)   ;;  = (if (not (empty? coll)) ...
    (or (neg? (first coll)) (recur (rest coll)))))
#'user/has-neg

user=> (has-neg [])
nil 

user=> (has-neg [1 2 -3 4])
true
```
user=> (defn has-neg [coll] (if-not (empty? coll) ;; = (if (not (empty? coll)) ... (or (neg? (first coll)) (recur (rest coll))))) #'user/has-neg user=> (has-neg []) nil user=> (has-neg [1 2 -3 4]) true
link | changes
```
user=> (if-not (zero? 0) :then :else)
:else
```
user=> (if-not (zero? 0) :then :else) :else
link | changes
```
;; See examples for "if" explaining Clojure's idea of logical true
;; and logical false.
```
;; See examples for "if" explaining Clojure's idea of logical true ;; and logical false.

Source clojure/core.clj:702 top

(defmacro if-not
  "Evaluates test. If logical false, evaluates and returns then expr, 
  otherwise else expr, if supplied, else nil."
  {:added "1.0"}
  ([test then] `(if-not ~test ~then nil))
  ([test then else]
   `(if (not ~test) ~then ~else)))

Vars in clojure.core/if-not:

Used in 0 other vars

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Clojure Core

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if-not

clojure.core

3 Examples top

See Also top

Source clojure/core.clj:702 top

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