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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