I am not that confident as Andrea, but bellow might be a "definitive"
solution too ;o)
function isFunction (x) {
switch(typeof x) {
case "function" : return true ;
case "object" :
if (( "function" !== typeof x.toString ) &&
( "function" !== typeof x.valueOf ))
return (x + "").match(/function/) !==
null ;
else
return Object.prototype.toString.call
(x) === "[object Function]" ;
break ;
default : return false ;
}
}
var breaker = {valueOf:function(){return
"[function]"},toString:null};
isFunction(breaker)
/*
false
*/
With IMHO less obfuscations ...
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