Window width resize observer

window.resize.js

/**
 * jQuery on resize by @italo_dr (twitter) @italodr (github)
 * Fix issue with iphone/ipad "resize" on height. When appears domain
 * field and bottom menu.
 * Add timer to launch function on resize end
 */
var timer;
var windowWidth = $(window).width();
$(window).on('resize', function(){
    if ($(window).width() != windowWidth) {
        windowWidth = $(window).width();
        timer && clearTimeout(timer);
        timer = setTimeout(function() {

            /* Your function here */

        }, 100);
    }
});