From 6542047b7c116539bdedb17345aae31a52f7d56c Mon Sep 17 00:00:00 2001
From: DarkWiiPlayer <darkwiiplayer@hotmail.com>
Date: Wed, 20 Sep 2023 13:26:14 +0200
Subject: [PATCH] Extract map of final values into change event

Cached on first use for performance and more DRY
---
 state.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/state.js b/state.js
index 8642007..979fc6c 100644
--- a/state.js
+++ b/state.js
@@ -1,8 +1,15 @@
 export class ChangeEvent extends Event {
+	#final
 	constructor(...changes) {
 		super('change')
 		this.changes = changes
 	}
+	get final() {
+		if (!this.#final) {
+			this.#final = new Map(changes)
+		}
+		return this.#final
+	}
 }
 
 export class MapStorage extends Storage {
@@ -50,8 +57,8 @@ export class State extends EventTarget {
 		// Try running a "<name>Changed" method for every changed property
 		// Can be disabled to maybe squeeze out some performance
 		if (options.methods ?? true) {
-			this.addEventListener("change", ({changes}) => {
-				new Map(changes).forEach((value, prop) => {
+			this.addEventListener("change", ({final}) => {
+				final.forEach((value, prop) => {
 					if (`${prop}Changed` in this) this[`${prop}Changed`](value)
 				})
 			})