mongo works

parts/3/followAlong/node_modules/mongoose/lib/helpers/minimize.js

@@ -0,0 +1,41 @@
+'use strict';
+
+const { isPOJO } = require('../utils');
+
+module.exports = minimize;
+
+/**
+ * Minimizes an object, removing undefined values and empty objects
+ *
+ * @param {Object} object to minimize
+ * @return {Object|undefined}
+ * @api private
+ */
+
+function minimize(obj) {
+  const keys = Object.keys(obj);
+  let i = keys.length;
+  let hasKeys;
+  let key;
+  let val;
+
+  while (i--) {
+    key = keys[i];
+    val = obj[key];
+
+    if (isPOJO(val)) {
+      obj[key] = minimize(val);
+    }
+
+    if (undefined === obj[key]) {
+      delete obj[key];
+      continue;
+    }
+
+    hasKeys = true;
+  }
+
+  return hasKeys
+    ? obj
+    : undefined;
+}