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React is a JavaScript library for building user interfaces, helping developers create web applications more efficiently and intuitively. In this course, we will learn the basic concepts of React by creating a simple diary application, and we will detail the process of preparing for an actual project.<\/p>\n

1. What is React?<\/h2>\n

React is a library that enables the development of declarative and component-based web applications. Developed by Facebook, it is now used by many companies and developers. The main advantages of React are as follows:<\/p>\n

Reusable Components:<\/strong> React allows developers to break the UI into smaller units called components. These components can easily be reused in different places.<\/li>\n
Virtual DOM:<\/strong> React uses a Virtual DOM to minimize actual DOM manipulations. This greatly enhances performance.<\/li>\n

One-way Data Flow:<\/strong> Since data flows in one direction only, it makes predicting the state of data easier and code maintenance more manageable.<\/li>\n<\/ul>\n
2. Overview of the Diary App Project<\/h2>\n
In this project, we will create a simple diary application that allows users to write, view, and delete diary entries. The basic functionalities are as follows:<\/p>\n
\n
View diary list<\/li>\n
Write a new diary entry<\/li>\n
Delete diary entries<\/li>\n<\/ul>\n
To implement these functionalities, we will learn about React’s state management and the way data is passed between components.<\/p>\n
3. Setting Up the Development Environment<\/h2>\n
Before starting the project, we need to set up the React development environment. The following tools need to be installed:<\/p>\n
\n
Node.js:<\/strong> A server-side JavaScript runtime used to run and manage React applications.<\/li>\n
npm or yarn:<\/strong> JavaScript package managers used to install React-related libraries.<\/li>\n
Code Editor:<\/strong> Choose an editor for coding tasks, such as VSCode or Atom.<\/li>\n<\/ul>\n
If Node.js is installed, use the following command to create a project with create-react-app:<\/p>\n
npx create-react-app diary-app<\/code><\/pre>\nWhen the command is executed, a folder named diary-app<\/strong> will be created, and the basic React structure will be set up. Move to the created folder and run the development server:<\/p>\n cd diary-app<\/code><\/pre>\nnpm start<\/code><\/pre>\nOpening http:\/\/localhost:3000<\/a> in a browser will show the default page.<\/p>\n 4. Designing the Component Structure<\/h2>\nThe app’s component structure will be designed as follows:<\/p>\n\n - App\n - DiaryList\n - DiaryForm\n<\/code><\/pre>\nThe App<\/strong> component is the top-level component that manages the state. The DiaryList<\/strong> component displays the list of diary entries, and the DiaryForm<\/strong> component provides a form for writing a new diary entry.<\/p>\n5. Managing State<\/h2>\nIn React components, state is a way to manage the data of a component. We will use the useState hook to manage diary data in the App<\/strong> component. For example, we can set the initial state to an empty array:<\/p>\n\nimport React, { useState } from 'react';\n\nconst App = () => {\n const [diaries, setDiaries] = useState([]);\n return (\n \n {\/* Components *\/}\n <\/div>\n );\n};\n<\/code><\/pre>\n6. Implementing the Diary Entry Form<\/h2>\nWe will create the DiaryForm<\/strong> component to allow users to write diary entries. We will create an input tag to handle user input and manage the input value using the useState hook:<\/p>\n\nconst DiaryForm = ({ onAdd }) => {\n const [text, setText] = useState('');\n\n const handleSubmit = (e) => {\n e.preventDefault();\n onAdd(text);\n setText('');\n };\n\n return (\n \n setText(e.target.value)}\" type=\"text\" value=\"{text}\" placeholder=\"Write your diary\"\/>\n