Niriter Inc.

var value = 0;
var old-value = value;

function oldornot(new-value) {
value = new-value;
   if new-value == old-value {
     echo "Not changed";
   }
   else {
     echo "Changed";
     old-value = new-value;
   }

oldornot(59)
// Changed
oldornot(59)
// Not changed

(function() {
  var addCl = document.querySelectorAll(".header ul li");
  for (var i = 0; i < addCl.length; i++) {
    addCl[i].onclick = function() {
        [].forEach.call(addCl, function(el) {
             el.classList.remove("onactive");
        });
        this.classList.add('onactive');
    }
    }
})();