From b5d8a56263d1d39f1e50d4eec9de0ae07887cc14 Mon Sep 17 00:00:00 2001
From: Jordan Eldredge <jordan@jordaneldredge.com>
Date: Thu, 2 Aug 2018 20:55:59 -0700
Subject: [PATCH] Memoize a selector

---
 js/selectors.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/js/selectors.js b/js/selectors.js
index f9c1e253..4adf00d1 100644
--- a/js/selectors.js
+++ b/js/selectors.js
@@ -18,8 +18,9 @@ import * as fromPlaylist from "./reducers/playlist";
 import * as fromDisplay from "./reducers/display";
 import { generateGraph } from "./resizeUtils";
 
-export const getEqfData = state => {
-  const { sliders } = state.equalizer;
+export const getSliders = state => state.equalizer.sliders;
+
+export const getEqfData = createSelector(getSliders, sliders => {
   const preset = {
     name: "Entry1",
     preamp: denormalize(sliders.preamp)
@@ -32,7 +33,7 @@ export const getEqfData = state => {
     type: "Winamp EQ library file v1.1"
   };
   return eqfData;
-};
+});
 
 export const getTracks = state => state.playlist.tracks;
 const getTrackOrder = state => state.playlist.trackOrder;