old code moved to legacy folder, new es6 code started in js/app

Author: eivers88

assets/js/app/index.js

@@ -0,0 +1,17 @@
+import debounce from './utilities/debounce';
+
+let app = {
+
+    start: function(){
+        console.log('app started');
+
+        window.addEventListener('resize', debounce(() => {
+            console.log('resize');
+        }, 250));
+
+    }
+
+
+};
+
+export default app;

assets/js/app/utilities/debounce.js

@@ -0,0 +1,20 @@
+// Returns a function, that, as long as it continues to be invoked, will not
+// be triggered. The function will be called after it stops being called for
+// N milliseconds. If `immediate` is passed, trigger the function on the
+// leading edge, instead of the trailing.
+function debounce(func, wait, immediate) {
+    let timeout;
+    return function() {
+        let context = this, args = arguments;
+        let later = function() {
+            timeout = null;
+            if (!immediate) func.apply(context, args);
+        };
+        let callNow = immediate && !timeout;
+        clearTimeout(timeout);
+        timeout = setTimeout(later, wait);
+        if (callNow) func.apply(context, args);
+    };
+}
+
+export default debounce;