firest commit

Author: ljlm0402

Diff for: README.md

@@ -1,68 +1,21 @@
-This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+# React Hooks Example
 
-## Available Scripts
+1. 함수만으로 React Component 개발
 
-In the project directory, you can run:
+2. 좀 더 손쉬운 State Management 제공
 
-### `yarn start`
+3. 커스텀 훅을 만들어 재사용될 소스를 분리
 
-Runs the app in the development mode.<br />
-Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+4. 별도의 재사용가능한 함수로 사용
 
-The page will reload if you make edits.<br />
-You will also see any lint errors in the console.
+5. 복잡한 컴포넌트 계층에서 자식 컴포넌트에서 props로 계속 전달하지 않고 사용할수 있다.
 
-### `yarn test`
+6. 코드로 간결하고 깔끔해지며 mobx, redux 없이도 간단한 상태관리가 가능하다.
 
-Launches the test runner in the interactive watch mode.<br />
-See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+## start
 
-### `yarn build`
+- git clone or Clone or download
 
-Builds the app for production to the `build` folder.<br />
-It correctly bundles React in production mode and optimizes the build for the best performance.
+- yarn install
 
-The build is minified and the filenames include the hashes.<br />
-Your app is ready to be deployed!
-
-See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
-
-### `yarn eject`
-
-**Note: this is a one-way operation. Once you `eject`, you can’t go back!**
-
-If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
-
-Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
-
-You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
-
-## Learn More
-
-You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
-
-To learn React, check out the [React documentation](https://reactjs.org/).
-
-### Code Splitting
-
-This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting
-
-### Analyzing the Bundle Size
-
-This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size
-
-### Making a Progressive Web App
-
-This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app
-
-### Advanced Configuration
-
-This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration
-
-### Deployment
-
-This section has moved here: https://facebook.github.io/create-react-app/docs/deployment
-
-### `yarn build` fails to minify
-
-This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify
+- yarn start

Diff for: src/App.css

@@ -0,0 +1,17 @@
+import React from "react";
+import TodoStore from "../context/TodoStore";
+import Header from "./Header";
+import Form from "./Form";
+import List from "./List";
+
+const App = () => {
+  return (
+    <TodoStore>
+      <Header />
+      <Form />
+      <List />
+    </TodoStore>
+  );
+};
+
+export default App;

Diff for: src/App.js

@@ -0,0 +1,19 @@
+import React, { useContext, useRef } from "react";
+import { TodoContext } from "../context/TodoStore.jsx";
+
+const Form = () => {
+  const inputRef = useRef(false);
+  const { dispatch } = useContext(TodoContext);
+  const addTodoData = e => {
+    e.preventDefault();
+    dispatch({ type: "ADD_TODO", payload: inputRef.current.value });
+  };
+  return (
+    <form action="">
+      <input type="text" ref={inputRef} />
+      <button onClick={addTodoData}>할일추가</button>
+    </form>
+  );
+};
+
+export default Form;

Diff for: src/App.test.js

@@ -0,0 +1,18 @@
+import React, { useContext } from "react";
+import "../css/Header.css";
+import { TodoContext } from "../context/TodoStore.jsx";
+
+const Header = () => {
+  const { todos } = useContext(TodoContext);
+  
+  return (
+    <>
+      <h1>HELLO TODO 애플리케이션</h1>
+      <div className="countInfo">
+        해야할일! {todos.filter(v => v.status === "todo").length}개 있습니다.
+      </div>
+    </>
+  );
+};
+
+export default Header;

Diff for: src/components/App.jsx

@@ -0,0 +1,20 @@
+import React, { useContext } from "react";
+import "../css/Item.css";
+import { TodoContext } from "../context/TodoStore.jsx";
+
+const Item = ({ todo }) => {
+  const { dispatch } = useContext(TodoContext);
+
+  const toggleItem = e => {
+    const id = e.target.dataset.id;
+    dispatch({ type: "CHANGE_TODO_STATUS", payload: id });
+  };
+
+  const itemClassName = todo.status === "done" ? "done" : "";
+
+  return (
+    <li data-id={todo.id} onClick={toggleItem} className={itemClassName}> {todo.title} </li>
+  );
+};
+
+export default Item;

Diff for: src/components/Form.jsx

@@ -0,0 +1,15 @@
+import React, { useContext } from "react";
+import Item from "./Item.jsx";
+import { TodoContext } from "../context/TodoStore.jsx";
+
+const List = () => {
+  const { todos, loading } = useContext(TodoContext);
+
+  let todoList = <div>loading...</div>;
+  if (!loading)
+    todoList = todos.map(todo => <Item key={todo.id} todo={todo} />);
+
+  return <ul>{todoList}</ul>;
+};
+
+export default List;

Diff for: src/components/Header.jsx

@@ -0,0 +1,27 @@
+import React, { useEffect, useReducer } from "react";
+import useFetch from "./useFetch.jsx";
+import { todoReducer } from './reducers.jsx';
+
+export const TodoContext = React.createContext();
+
+const TodoStore = (props) => {
+  const [todos, dispatch] = useReducer(todoReducer, []);
+
+  const setInitData = (initData) => {
+    dispatch({ type: "SET_INIT_DATA", payload: initData })
+  }
+
+  const loading = useFetch(setInitData);
+
+  useEffect(() => {
+    console.log("새로운 내용이 렌더링됐네요", todos);
+  }, [todos]);
+
+  return (
+    <TodoContext.Provider value={{ todos, loading, dispatch }}>
+    { props.children }
+    </TodoContext.Provider>
+  );
+};
+
+export default TodoStore;

Diff for: src/components/Item.jsx

@@ -0,0 +1,20 @@
+export const todoReducer = (todos, { type, payload }) => {
+  switch (type) {
+    case "ADD_TODO":
+      return [...todos, { id: todos.length, title: payload, status: "todo" }];
+
+    case "SET_INIT_DATA":
+      return payload;
+
+    case "CHANGE_TODO_STATUS":
+      return todos.map(todo => {
+        if (todo.id === +payload) {
+          if (todo.status === "done") todo.status = "todo";
+          else todo.status = "done";
+        }
+        return todo;
+      });
+
+    default: break;
+  }
+};

Diff for: src/components/List.jsx

@@ -0,0 +1,43 @@
+import { useState, useEffect } from "react";
+
+const userData = [
+  {
+    id: 1111,
+    title: "공부하기",
+    status: "todo"
+  },
+  {
+    id: 2222,
+    title: "스터디준비",
+    status: "todo"
+  },
+  {
+    id: 3333,
+    title: "알고리즘공부",
+    status: "todo"
+  },
+  {
+    id: 4444,
+    title: "컴퓨터게임",
+    status: "todo"
+  }
+];
+
+const useFetch = (callback) => {
+  const [loading, setLoading] = useState();
+
+  const fetchInitialData = () => {
+    setLoading(true);
+    callback(userData);
+    setLoading(false);
+  };
+  
+  // 배열 초기값 설정시 한번만 실행 즉, 로딩시 한번만 실행
+  useEffect(() => {
+    fetchInitialData();
+  }, []);
+
+  return loading;
+};
+
+export default useFetch;

Diff for: src/context/TodoStore.jsx

@@ -0,0 +1,3 @@
+.countInfo {
+  margin-bottom: 1rem;
+}

Diff for: src/context/reducers.jsx

@@ -0,0 +1,4 @@
+.done {
+  text-decoration: line-through;
+  font-style: italic;
+}

Diff for: src/context/useFetch.jsx

@@ -11,3 +11,7 @@ code {
   font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
     monospace;
 }
+
+#root {
+  padding: 1.5rem;
+}

Diff for: src/css/Header.css

@@ -0,0 +1,8 @@
+import React from "react";
+import ReactDOM from "react-dom";
+import "./css/index.css";
+import App from "./components/App";
+import * as serviceWorker from "./serviceWorker";
+
+ReactDOM.render(<App />, document.getElementById("root"));
+serviceWorker.unregister();