# Mobx
- https://mobx.js.org/
- Simple, scalable state management.

## 설치
- `npm install mobx`
- `npm install mobx-react`

## Quick example
```js
import React from "react"
import ReactDOM from "react-dom"
import { makeAutoObservable } from "mobx"
import { observer } from "mobx-react"

// Model the application state.
class Timer {
  secondsPassed = 0

  constructor() {
    makeAutoObservable(this)
  }

  increase() {
    this.secondsPassed += 1
  }

  reset() {
    this.secondsPassed = 0
  }
}

const myTimer = new Timer()

// Build a "user interface" that uses the observable state.
const TimerView = observer(({ timer }) => (
  <button onClick={() => timer.reset()}>Seconds passed: {timer.secondsPassed}</button>
))

ReactDOM.render(<TimerView timer={myTimer} />, document.body)

// Update the 'Seconds passed: X' text every second.
setInterval(() => {
  myTimer.increase()
}, 1000)
```