JavaScript SetInterval - Pass function pointer instead of String

Answer 1

is XService.poll a 'function' and 'XService.pollInterval' a number at that specific time?

Edit: Since you posted the code just now..

setInterval(

    function() {
        XService.poll();
    }, XService.pollInterval

);

Answer 2

What the function is bound to changes.

When you call the first, your 'this' statement is bound to XService object. When you call the second, your 'this' statement is bound to the window object.

for example, say we have XService with poll like this

function poll(){ alert(this); }

if the first example, it will alert the XService object, but in the second example it will alert the window object.

I don't know the syntax except for in mootools, but in mootoos you would call

setInterval(XService.poll.bind(XService), 100)

and it would call the method correctly