pseudo-code

onReady pattern

var ready = false,
    readyCallbacks = [];

function onReady(callback) {
    if (ready) return callback();
    readyCallbacks.push(callback);
}

function signalReady() {
    ready = true;
    for (var i = 0, l = readyCallbacks.length; i < l; i++) {
        (readyCallbacks[i])();
    }
}

...blah blah blah

...something(s) is(are) defined that should == app is ready

signalReady();