jQuery / Javascript code check, if not undefined

Question

Is this code good?

var wlocation = $(this).closest('.myclass').find('li a').attr('href'); if (wlocation.prop !== undefined) { window.location = wlocation; } 

or should I do

var wlocation = $(this).closest('.myclass').find('li a').attr('href'); if (wlocation.prop !== "undefined") { window.location = wlocation; } 

Answer 1

I like this:

if (wlocation !== undefined) 

But if you prefer the second way wouldn't be as you posted. It would be:

if (typeof wlocation  !== "undefined") 

Answer 2

I generally like the shorthand version:

if (!!wlocation) { window.location = wlocation; }