초기값 유효성 검사

Author: bgyoons

src/TodoCount.js

@@ -6,7 +6,9 @@ export default function TodoCount({ $target, initialCount }) {
   const $container = document.createElement("div");
   $target.appendChild($container);
 
-  this.state = initialCount;
+  if (initialCount.total && initialCount.done) {
+    this.state = initialCount;
+  } else this.state = { total: 0, done: 0 };
 
   this.setState = (nextState) => {
     this.state = nextState;

src/TodoList.js

@@ -10,7 +10,8 @@ export default function TodoList({ $target, initialState, updateCount }) {
   const $todoList = document.createElement("div");
   $target.appendChild($todoList);
 
-  this.state = initialState;
+  if (Array.isArray(initialState)) this.state = initialState;
+  else this.state = [];
 
   this.setState = (nextState) => {
     this.state = nextState;