execution order with jQuery's AJAX

I have this code (ajax is async):

function echoHello()
{
    return "hello";
}

function echoWorld()
{
    return $.ajax({
        //this will return "world";
    });
}

console.log(echoHello());

$.when(echoWorld()).done(function(response)
{
    console.log(response);
});

which outputs "hello" and "world" (in that order). But if change it a little bit, so the console.log() is in different order:

function echoHello()
{
    return "hello";
}

function echoWorld()
{
    return $.ajax({
        //this will return "world";
    });
}

$.when(echoWorld()).done(function(response)
{
    console.log(response);
});

console.log(echoHello());

is the same output guaranteed? Or it could potentially output "world" and then "hello"?

from execution order with jQuery's AJAX