How to test if navigation menu has all expected items

I am using nightwatchJS (Webdriver/Selenium) to test my nodeJS application.

Now I would like to test if a navigation bar is existing and also I want to test if the items of the navBar are as expected.

This is how I tried to get all navigation items. But I don't know how to check the elements. Also I think this is a bit to complicated. Is this the correct way to use nightwatchJS?

module.exports = {
    'navigation': function(browser) {
        var navElements = []

        function getNavElements(elements) {
            elements.value.forEach(function(element) {
                browser.elementIdText(element.ELEMENT, function(res) {
                    navElements.push(res.value)
                })
            })
        }

        browser
            .url(browser.launchUrl)
            .waitForElementVisible('#nav', 10000)

        browser.expect.element('#nav').to.be.present

        browser.elements('css selector', '#nav > .item', getNavElements)
        browser.expect(navElements).to.equal(['First', 'Second', 'Third'])

        browser.end()
    }
}