react app

react-app/node_modules/react/lib/shallowEqual.js

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+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule shallowEqual
+ */
+
+'use strict';
+
+/**
+ * Performs equality by iterating through keys on an object and returning
+ * false when any key has values which are not strictly equal between
+ * objA and objB. Returns true when the values of all keys are strictly equal.
+ *
+ * @return {boolean}
+ */
+function shallowEqual(objA, objB) {
+  if (objA === objB) {
+    return true;
+  }
+  var key;
+  // Test for A's keys different from B.
+  for (key in objA) {
+    if (objA.hasOwnProperty(key) &&
+        (!objB.hasOwnProperty(key) || objA[key] !== objB[key])) {
+      return false;
+    }
+  }
+  // Test for B's keys missing from A.
+  for (key in objB) {
+    if (objB.hasOwnProperty(key) && !objA.hasOwnProperty(key)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+module.exports = shallowEqual;