From e13857d6462220fce329e752e85a75174c39b9f8 Mon Sep 17 00:00:00 2001
From: nklhrstv <me@nikolahristov.com>
Date: Sun, 22 Mar 2020 00:04:00 +0200
Subject: [PATCH] useDeepEqualMemo hook implemented

---
 src/common/index.js            |  2 ++
 src/common/useDeepEqualMemo.js | 14 ++++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 src/common/useDeepEqualMemo.js

diff --git a/src/common/index.js b/src/common/index.js
index efeb21981..4c2327d57 100644
--- a/src/common/index.js
+++ b/src/common/index.js
@@ -24,6 +24,7 @@ const useAnimationFrame = require('./useAnimationFrame');
 const useBinaryState = require('./useBinaryState');
 const useCoreEvent = require('./useCoreEvent');
 const useDeepEqualEffect = require('./useDeepEqualEffect');
+const useDeepEqualMemo = require('./useDeepEqualMemo');
 const useDeepEqualState = require('./useDeepEqualState');
 const useFullscreen = require('./useFullscreen');
 const useInLibrary = require('./useInLibrary');
@@ -60,6 +61,7 @@ module.exports = {
     useBinaryState,
     useCoreEvent,
     useDeepEqualEffect,
+    useDeepEqualMemo,
     useDeepEqualState,
     useFullscreen,
     useInLibrary,
diff --git a/src/common/useDeepEqualMemo.js b/src/common/useDeepEqualMemo.js
new file mode 100644
index 000000000..4b1d42932
--- /dev/null
+++ b/src/common/useDeepEqualMemo.js
@@ -0,0 +1,14 @@
+const React = require('react');
+const isEqual = require('lodash.isequal');
+
+const useDeepEqualMemo = (cb, deps) => {
+    const valueRef = React.useRef(cb());
+    const prevDepsRef = React.useRef(deps);
+    if (!isEqual(prevDepsRef.current, deps)) {
+        valueRef.current = cb();
+        prevDepsRef.current = deps;
+    }
+    return valueRef.current;
+};
+
+module.exports = useDeepEqualMemo;