2021년 2월 23일 복기

https://www.youtube.com/watch?v=kK_Wqx3RnHk&t=63s

import React, { useState, useReducer } from "react";

const ACTIONS = {
  INCREMENT: "increment",
  DECREMENT: "decrement",
};

function reducer(state, action) {
  switch (action.type) {
    case ACTIONS.INCREMENT:
      return { count: state.count + 1 };
    case ACTIONS.DECREMENT:
      return { count: state.count - 1 };
    default:
      return state;
  }
}
function App() {
  const [state, dispatch] = useReducer(reducer, { count: 0 });

  function increment() {
    dispatch({ type: "increment" });
  }
  function decrement() {
    dispatch({ type: "increment" });
  }

  return (
    <>
      <button onClick={decrement}>-</button>
      <span>{state.count}</span>
      <button onClick={increment}>+</button>
    </>
  );
}

export default App;