<div>jQuery.isFunction( obje[ 0 ] ) = <span></span></div>
<div>jQuery.isFunction( obje[ 1 ] ) = <span></span></div>
<div>jQuery.isFunction( obje[ 2 ] ) = <span></span></div>

function w3tr() {}
var obje = [
  function() {},
  { a:20, b:25 },
  null,
  w3tr,
  "foksiyon"
];

jQuery.each( obje, function( e ) {
  var fonk = jQuery.isFunction( obje[ e ]);
  $( "span" ).eq( e ).text( fonk );
});