Added hasClass/toggleClass snippets

snippets/hasClass.md

@@ -0,0 +1,13 @@
+### hasClass
+
+Returns `true` if the element has the specified class, `false` otherwise.
+
+Use `element.classList.contains()` to check if the element has the specified class.
+
+```js
+const hasClass = (el, className) => el.classList.contains(className);
+```
+
+```js
+hasClass(document.querySelector('p.special')[0],'special') // true
+```