README.md

React.js Clone

Motivation

• For light weight lib like react for vanilla js project
• To confirm the react lifecycle

Topics

• set up project with webpack and babel
• jsx transforming with babel plugin
• config prettier and eslint
• built react-like lib from scratch
• support useState, useEffect, function component
• webpack dev server

How to use this library

1. Download or clone this repo

https://github.com/FrozenIce0617/my-own-react-lib 

2. Install dependencies

yarn or yarn install

Now, you can use MyOwnReact as like react in .src/index.js file.

// import library
import MyOwnReact from '../lib/MyOwnReact'
import App from './App'

MyOwnReact.render(<App />, document.getElementById('root'))

we can create App in ./App.js file like react component

import MyOwnReact from '../lib/MyOwnReact'
const App = () => {
    return <h1>Hello world </h1>
}

export default App

you can run npx webpack serve as dev server, then you can see the app is running at localhost:9000 on browser.

demo app

The demo app shows the dad joke and possible to see next or prev joke by clicking buttons. It is implemented with useEffect, useState of this lib.

import MyOwnReact from '../lib/MyOwnReact'
require('./style.css')

const DAD_JOKE_BASE_URL = 'https://icanhazdadjoke.com'
const MAX_INDEX = 10

const App = () => {
  const [index, setIndex] = MyOwnReact.useState(0)
  const [jokes, setJokes] = MyOwnReact.useState([])

  const handleEvent = (isNext = true) => {
    const nextIndex = isNext ? index + 1 : index - 1
    setIndex((nextIndex + MAX_INDEX) % MAX_INDEX)
  }

  MyOwnReact.useEffect(() => {
    // fetching joke list using api at first loading...
    fetch(`${DAD_JOKE_BASE_URL}/search`, {
      headers: {
        accept: 'application/json',
      },
    })
      .then((response) => response.json())
      .then((jsonData) => {
        setJokes(jsonData.results)
      })
  }, [])

  return (
    <div className="App">
      <div className="content">
        <div className="controls">
          <button onClick={() => handleEvent(false)} className="btn btn-prev">
            Prev
          </button>
          <h2>Joke {index + 1}</h2>
          <button onClick={() => handleEvent()} className="btn btn-next">
            Next
          </button>
        </div>
        <h3 className="joke">{jokes[index]?.joke}</h3>
      </div>
    </div>
  )
}

export default App