From a9e4ce368d5db545df4b65e0c6574625e6615840 Mon Sep 17 00:00:00 2001
From: Vyrtsev Mikhail <reeywhaar@gmail.com>
Date: Sun, 7 Jul 2019 05:49:01 +0300
Subject: [PATCH] add cmpRef util

---
 frontend/app/utils/cmpRef.ts | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 frontend/app/utils/cmpRef.ts

diff --git a/frontend/app/utils/cmpRef.ts b/frontend/app/utils/cmpRef.ts
new file mode 100644
index 00000000..d803b0ed
--- /dev/null
+++ b/frontend/app/utils/cmpRef.ts
@@ -0,0 +1,13 @@
+import isEqual from 'lodash/isEqual';
+
+/**
+ * Deeply compares two entities,
+ * and if they are equal, then first entity
+ * will be returned
+ *
+ * Useful when we deal with react objects
+ */
+export function cmpRef<T>(a: T, b: T): T {
+  if (isEqual(a, b)) return a;
+  return b;
+}