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doc source examples comments

1.3.0 permalink

1.2.0
1.3.0

when

clojure.core

(when test & body)

Evaluates test. If logical true, evaluates body in an implicit do.

3 Examples top

link | changes
```
user=> (when (= 1 1) true)
true

user=> (when (not= 1 1) true)
nil
```
user=> (when (= 1 1) true) true user=> (when (not= 1 1) true) nil
link | changes
```
user=> (def has-value (when true
                            (println "Hello World")
                            "Returned Value"))
Hello World
#'user/has-value

user=> has-value
"Returned Value"
```
user=> (def has-value (when true (println "Hello World") "Returned Value")) Hello World #'user/has-value user=> has-value "Returned Value"
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:454 top

(defmacro when
  "Evaluates test. If logical true, evaluates body in an implicit do."
  {:added "1.0"}
  [test & body]
  (list 'if test (cons 'do body)))

Vars in clojure.core/when:

Used in 0 other vars

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Clojure Core

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when

clojure.core

3 Examples top

See Also top

Source clojure/core.clj:454 top

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