Izmjenjena struktura, dodan backand

web/node_modules/flatten/index.js

@@ -0,0 +1,23 @@
+module.exports = function flatten(list, depth) {
+  depth = (typeof depth == 'number') ? depth : Infinity;
+
+  if (!depth) {
+    if (Array.isArray(list)) {
+      return list.map(function(i) { return i; });
+    }
+    return list;
+  }
+
+  return _flatten(list, 1);
+
+  function _flatten(list, d) {
+    return list.reduce(function (acc, item) {
+      if (Array.isArray(item) && d < depth) {
+        return acc.concat(_flatten(item, d + 1));
+      }
+      else {
+        return acc.concat(item);
+      }
+    }, []);
+  }
+};