V4 ;o)
Is this not the simplest working solution ?
// GPL (c) 2009 by DBJ.ORG
function isFunction(x) {
switch (typeof x) {
case "function" : return true ;
case "object" : return (x + "").match(/
function/) !== null ;
default : return false ;
}
}
isFunction( top.alert )
/*
true
*/
isFunction( isFunction )
/*
true
*/
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