simple diary : refactoring - context api

simplediary/src/App.js

@@ -36,9 +36,10 @@ const reducer = (state, action) => {
   }
 };
 
-const App = () => {
-  // const [data, setData] = useState([]);
+export const DiaryStateContext = React.createContext();
+export const DiaryDispatchContext = React.createContext();
 
+const App = () => {
   const [data, dispatch] = useReducer(reducer, []);
 
   const dataId = useRef(0);
@@ -89,6 +90,10 @@ const App = () => {
     dispatch({ type: "EDIT", targetId, newContent });
   }, []);
 
+  const memoizedDispatches = useMemo(() => {
+    return { onCreate, onRemove, onEdit };
+  }, []);
+
   const getDiaryAnalysis = useMemo(() => {
     const goodCount = data.filter((it) => it.emotion >= 3).length;
     const badCount = data.length - goodCount;
@@ -99,14 +104,18 @@ const App = () => {
   const { goodCount, badCount, goodRatio } = getDiaryAnalysis;
 
   return (
-    <div className="App">
-      <DiaryEditor onCreate={onCreate} />
-      <div>전체 일기 : {data.length}</div>
-      <div>기분 좋은 일기 : {goodCount}</div>
-      <div>기분 나쁜 일기 : {badCount}</div>
-      <div>기분 좋은 일기 비율: {goodRatio} %</div>
-      <DiaryList onEdit={onEdit} onRemove={onRemove} diaryList={data} />
-    </div>
+    <DiaryStateContext.Provider value={data}>
+      <DiaryDispatchContext.Provider value={memoizedDispatches}>
+        <div className="App">
+          <DiaryEditor />
+          <div>전체 일기 : {data.length}</div>
+          <div>기분 좋은 일기 : {goodCount}</div>
+          <div>기분 나쁜 일기 : {badCount}</div>
+          <div>기분 좋은 일기 비율: {goodRatio} %</div>
+          <DiaryList />
+        </div>
+      </DiaryDispatchContext.Provider>
+    </DiaryStateContext.Provider>
   );
 };
 

simplediary/src/DiaryEditor.js

@@ -1,6 +1,9 @@
-import React, { useRef, useState } from "react";
+import React, { useContext, useRef, useState } from "react";
+import { DiaryDispatchContext } from "./App";
+
+const DiaryEditor = () => {
+  const { onCreate } = useContext(DiaryDispatchContext);
 
-const DiaryEditor = ({ onCreate }) => {
   const authorInput = useRef();
   const contentInput = useRef();
   const [state, setState] = useState({

simplediary/src/DiaryList.js

@@ -1,6 +1,10 @@
+import { useContext } from "react";
+import { DiaryDispatchContext, DiaryStateContext } from "./App";
 import DiaryItem from "./DiaryItem";
 
-const DiaryList = ({ onEdit, onRemove, diaryList }) => {
+const DiaryList = () => {
+  const diaryList = useContext(DiaryStateContext);
+  const { onEdit, onRemove } = useContext(DiaryDispatchContext);
   return (
     <div className="DiaryList">
       <h2>일기 리스트</h2>