From bafa8817da7753f36e4375db49ff56a9a3517808 Mon Sep 17 00:00:00 2001
From: Kia King Ishii <kia.king.08@gmail.com>
Date: Tue, 28 Jan 2020 01:09:46 +0900
Subject: [PATCH] refactor: do not mutate mutation payload in the todo app
 example (#1670)

* refactor: do not mutate mutation payload in the todo app example

* refactor: make things a bit easier to read
---
 examples/todomvc/store/mutations.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/examples/todomvc/store/mutations.js b/examples/todomvc/store/mutations.js
index d0be5bca2..f68537b8d 100644
--- a/examples/todomvc/store/mutations.js
+++ b/examples/todomvc/store/mutations.js
@@ -15,7 +15,12 @@ export const mutations = {
   },
 
   editTodo (state, { todo, text = todo.text, done = todo.done }) {
-    todo.text = text
-    todo.done = done
+    const index = state.todos.indexOf(todo)
+
+    state.todos.splice(index, 1, {
+      ...todo,
+      text,
+      done
+    })
   }
 }