finalized JS DOM

03_dom/uebungen/u18_cuteycats/assets/js/libs/helpers.js

@@ -0,0 +1,17 @@
+const $ = (qs) => document.querySelector(qs);
+const $$ = (qs) => Array.from(document.querySelectorAll(qs));
+
+const $on = (el, ev, fn) => {
+  Array.isArray(el) ? el.forEach((ae) => $on(ae, ev, fn)) : el.addEventListener(ev, fn);
+  return el;
+};
+
+Node.prototype.on = function (name, fn) {
+  this.addEventListener(name, fn);
+  return this;
+};
+
+Array.prototype.on = Array.prototype.addEventListener = function (name, fn) {
+  this.forEach((elem) => elem.addEventListener(name, fn));
+  return this;
+};