Clojure pre assertion functions does not work with keyword?

2014-02-13 Thread Mamun 
Hi

I am just testing clojure :pre condition. But look like using keyword?, it 
is not working in clojure 1.5.1. 

(defn check-keyword [v] {:pre [keyword? v]} v)

(defn check-nil [v] {:pre [nil? v]} v)

(check-keyword “sdf”) ;Not throwing exception here

(check-nil nil) ;Throwing exception



Br,

Mamun

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Re: Clojure pre assertion functions does not work with keyword?

2014-02-13 Thread Ambrose Bonnaire-Sergeant 
Hi Mamun,

This is the correct syntax (you're missing some parens).

(defn check-keyword [v] {:pre [(keyword? v)]} v)

Thanks,
Ambrose


On Thu, Feb 13, 2014 at 6:47 PM, Mamun mamuni...@gmail.com wrote:

 Hi

 I am just testing clojure :pre condition. But look like using keyword?, it
 is not working in clojure 1.5.1.

 (defn check-keyword [v] {:pre [keyword? v]} v)

 (defn check-nil [v] {:pre [nil? v]} v)

 (check-keyword sdf) ;Not throwing exception here

 (check-nil nil) ;Throwing exception



 Br,

 Mamun

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Re: Clojure pre assertion functions does not work with keyword?

2014-02-13 Thread Mamun 
HI Ambrose,

Thanks for your reply. But why this one is working?

 (defn check-nil [v]
 {:pre [nil? v]}
  v)

Br,
Mamun


On Thursday, February 13, 2014 11:51:31 AM UTC+1, Ambrose Bonnaire-Sergeant 
wrote:

 Hi Mamun,

 This is the correct syntax (you're missing some parens).

 (defn check-keyword [v] {:pre [(keyword? v)]} v)

 Thanks,
 Ambrose


 On Thu, Feb 13, 2014 at 6:47 PM, Mamun mamu...@gmail.com javascript:wrote:

 Hi

 I am just testing clojure :pre condition. But look like using keyword?, 
 it is not working in clojure 1.5.1. 
  
 (defn check-keyword [v] {:pre [keyword? v]} v)

 (defn check-nil [v] {:pre [nil? v]} v)

 (check-keyword “sdf”) ;Not throwing exception here

 (check-nil nil) ;Throwing exception



 Br,

 Mamun

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Re: Clojure pre assertion functions does not work with keyword?

2014-02-13 Thread Ambrose Bonnaire-Sergeant 
It doesn't work, in your OP it incorrectly throws an exception when you
pass it nil.

:pre just takes a sequence of expressions which are executed like `do`, and
throws an exception if any expression returns a false value.

Thanks,
Ambrose


On Thu, Feb 13, 2014 at 7:53 PM, Mamun mamuni...@gmail.com wrote:

 HI Ambrose,

 Thanks for your reply. But why this one is working?


  (defn check-nil [v]
  {:pre [nil? v]}
   v)

 Br,
 Mamun



 On Thursday, February 13, 2014 11:51:31 AM UTC+1, Ambrose
 Bonnaire-Sergeant wrote:

 Hi Mamun,

 This is the correct syntax (you're missing some parens).

 (defn check-keyword [v] {:pre [(keyword? v)]} v)

 Thanks,
 Ambrose


 On Thu, Feb 13, 2014 at 6:47 PM, Mamun mamu...@gmail.com wrote:

 Hi

 I am just testing clojure :pre condition. But look like using keyword?,
 it is not working in clojure 1.5.1.

 (defn check-keyword [v] {:pre [keyword? v]} v)

 (defn check-nil [v] {:pre [nil? v]} v)

 (check-keyword sdf) ;Not throwing exception here

 (check-nil nil) ;Throwing exception



 Br,

 Mamun

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