flow like the river

VISUALIZACION/node_modules/ngraph.merge/index.js

@@ -0,0 +1,31 @@
+module.exports = merge;
+
+/**
+ * Augments `target` with properties in `options`. Does not override
+ * target's properties if they are defined and matches expected type in 
+ * options
+ *
+ * @returns {Object} merged object
+ */
+function merge(target, options) {
+  var key;
+  if (!target) { target = {}; }
+  if (options) {
+    for (key in options) {
+      if (options.hasOwnProperty(key)) {
+        var targetHasIt = target.hasOwnProperty(key),
+            optionsValueType = typeof options[key],
+            shouldReplace = !targetHasIt || (typeof target[key] !== optionsValueType);
+
+        if (shouldReplace) {
+          target[key] = options[key];
+        } else if (optionsValueType === 'object') {
+          // go deep, don't care about loops here, we are simple API!:
+          target[key] = merge(target[key], options[key]);
+        }
+      }
+    }
+  }
+
+  return target;
+}