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 <
[email protected]> 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 <[email protected]> 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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