[Introduction to React] A complete guide to creating a notepad app | Even beginners can easily implement it!

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By creating a "notepad app" with React,Basic functions such as input forms, list display, and status managementYou can learn them all at once.
This is the perfect subject for those who have learned React but don't know what to actually create, or who want to practice form processing and saving functions.
In this article, even beginners canHow to make a React notepad app in just a few minutesWe will explain the following in detail.

Guide to building a React notepad app

Conclusion: Notepad apps are great for learning form processing

When learning React, it is essential to know the process of "receiving input from a form and displaying it as a list."
In this memo pad app,Basic elements such as useState, map, onChange, onClickI will make sure to use it.
Through this subject,A structure that lets you feel the movement of ReactYou can understand.

Preparing React and building a development environment

Preparing Node.js and npm

To run React, you need Node.js and npm. Download them here:

  • https://nodejs.org/ja/

Check with command:

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Create a project with Create React App

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Your development environment is now ready.

Required features and configuration for a notepad app

List of features to be implemented

  • Add a note (enter → add with button)
  • Delete a note (with delete button)
  • Input form state management (useState)

Component Configuration

  • App: Manage status and overall display
  • MemoInput: Input field and add button
  • MemoList: List of memos
  • MemoItem: Display and delete a single memo

Breaking it down into smaller chunks makes the code easier to read.

Steps to implement a React notepad app

MemoInput.js

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(
    
      
        
               
      
    
  ); };

MemoItem.js

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MemoList.js

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App.js

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(
    
      
       />
       />
    
  ); }

Common errors and solutions

Notes not being added

  • If the input is blank it will not be added.
  • text.trim() This prevents any blank spaces.

The delete function doesn't work

  • key={memo.id} If this is missing, React will not render properly.

Support systems and materials to help you learn React

Official Links

  • GIGA School Initiative (Ministry of Education, Culture, Sports, Science and Technology): https://www.mext.go.jp/a_menu/other/index_00001.htm
  • React official tutorial: https://ja.reactjs.org/tutorial/tutorial.html

Other reference materials

[React for Beginners] A complete guide to creating a ToDo list app! Even beginners can implement it right away
Even if you are a React beginner, you can rest assured! A complete guide to creating a to-do list app from scratch. We will carefully explain everything from environment setup, basic operations, and implementation code.
programmingschool21.com

Completed code summary

All the code is App.js, MemoInput.js, MemoList.js, MemoItem.js It is divided into four files:
You can experience React's form processing, list display, and state management with a minimal configuration.

Summary: The perfect topic for getting started with React

Creating a notepad app with ReactIdeal as a starting point for full-scale app developmentis.
Keeping the structure simple,Input/Display/DeleteYou can learn the following series of steps.
Please give it a try as your first React project.

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