RahimGuerfi

const menu = {
    _courses: {
        appetizers: [],
        mains: [],
        desserts: [],
    },
    get courses() {
        //return Object.entries(this._courses);
        return {
            appetizers: this.appetizers,

jeongtae

import { useEffect, useRef } from 'react';

function usePrevious<T>(value: T): T | undefined {
  const ref = useRef<T>();
  useEffect(() => {
    ref.current = value;
  }, [value]);
  return ref.current;
}