Actually, that object could hack mine as well so, this is my definitive
solution.
var isFunction = (function(toString){
var s = toString.call(toString),
u = typeof u;
return typeof this.alert === "object" ?
function(f){
return s === toString.call(f) || (!!f && typeof f.toString == u
&& typeof f.valueOf == u && /^\s*\bfunction\b/.test(f));
}:
function(f){
return s === toString.call(f);
}
;
})(Object.prototype.toString);
Regards
On Wed, Aug 5, 2009 at 9:27 AM, Andrea Giammarchi <
andrea.giammar...@gmail.com> wrote:
> Sorry, forgot an argument ...
>
> var isFunction = (function(toString){
> var s = toString.call(toString),
> u = typeof u;
> return typeof this.alert === "object" ?
> function(f){
> return s === toString.call(f) || (!!f && typeof f.toString == u
> && /^\s*\bfunction\b/.test(f));
> }:
> function(f){
> return s === toString.call(f);
> }
> ;
> })(Object.prototype.toString);
>
> LOL, regards
>
>
> On Wed, Aug 5, 2009 at 9:25 AM, Andrea Giammarchi <
> andrea.giammar...@gmail.com> wrote:
>
>> var o = {valueOf:function(){return "[function]"},toString:null};
>>
>> alert(isFunction(o)); // true in IE
>>
>> DBJ what is the problem, really? I wrote two options and both do what you
>> are trying to di with hundreds of tests ... is it that difficult?
>>
>> var isFunction = (function(toString){
>> var s = toString.call(toString),
>> u = typeof u;
>> return typeof this.alert === "object" ?
>> function(f){
>> return s === toString.call(f) || (!!f && typeof f.toString ==
>> u && /^\s*\bfunction\b/.test(f));
>> }:
>> function(){
>> return s === toString.call(f);
>> }
>> ;
>> })(Object.prototype.toString);
>>
>> Regards
>>
>>
>>
>>
>> On Wed, Aug 5, 2009 at 8:57 AM, DBJDBJ <dbj...@gmail.com> wrote:
>>
>>>
>>> V.5 ?!
>>> Here is the (hopefully) proper verion :
>>>
>>> // GPL (c) 2009 by dbj.org
>>> function isFunction (x) {
>>> switch(typeof x) {
>>> case "function" : return true ;
>>> case "object" :
>>> if ( "function" !== typeof x.toString )
>>> return (x + "").match(/function/) !==
>>> null ;
>>> else
>>> return Object.prototype.toString.call
>>> (x) === "[object Function]" ;
>>> break ;
>>> default : return false ;
>>> }
>>> }
>>>
>>> // this was breaking the previous version
>>> window.test = {
>>> toString: function() { return '[function]'; }
>>> };
>>>
>>> isFunction( test )
>>> /*
>>> false
>>> */
>>> isFunction( isFunction )
>>> /*
>>> true
>>> */
>>> isFunction( confirm )
>>> /*
>>> true
>>> */
>>>
>>> >>>
>>>
>>
>
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