You should get familiar with the "syntax" of "if", comment and other basic
things in Clojure:
(defn boolean [x]
(if (or (false? x) (nil? x))
false
true))
;; this is a comment
;; you should use Clojure's built-in "boolean" instead of define your own
(defn abs [x]
(if (< x 0)
(- x)
x))
;; you could use Math/abs instead
(defn teen? [age]
(< 12 age 20))
;; here the "if" **form** is not needed, not the "if" symbol/macro
2014-04-23 18:45 GMT+08:00 Roelof Wobben <[email protected]>:
> (defn boolean [x]
> (or (false? x)(nil? x))
> false;
> true)
>
> (defn abs [x]
> (< x 0)
> (* x -1);
> x)
>
> (defn teen? [age]
> (< 12 age 20)
> true;
> false)
>
Regards,
Xu Hui Hui
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