app.js

const menu = [
    {
      id: 1,
      title: "Tteokbokki",
      category: "Korea",
      price: 10.99,
      img:
        "https://twoplaidaprons.com/wp-content/uploads/2020/09/tteokbokki-top-down-view-of-tteokbokki-in-a-bowl-500x500.jpg",
      desc: `Spicy rice cakes, serving with fish cake.`,
    },
    {
      id: 2,
      title: "Chicken Ramen",
      category: "Japan",
      price: 7.99,
      img:
        "https://www.forkknifeswoon.com/wp-content/uploads/2014/10/simple-homemade-chicken-ramen-fork-knife-swoon-01.jpg",
      desc: `Chicken noodle soup, serving with vegetables such as soy bean, green onion. In an optional you can ask for egg. `,
    },
    {
      id: 3,
      title: "Bibimbap",
      category: "Korea",
      price: 8.99,
      img:
        "https://dwellbymichelle.com/wp-content/uploads/2020/05/DWELL-bibimbap.jpg",
      desc: `Boiling vegetables, serving with special hot sauce`,
    },
    {
      id: 4,
      title: "Dan Dan Mian",
      category: "China",
      price: 5.99,
      img:
        "https://www.savingdessert.com/wp-content/uploads/2019/02/Dan-Dan-Noodles-10.jpg",
      desc: `Dan dan noodle, serving with green onion `,
    },
    {
      id: 5,
      title: "Yangzhou Fried Rice",
      category: "China",
      price: 12.99,
      img:
        "https://salu-salo.com/wp-content/uploads/2013/02/Yangzhou-Fried-Rice1.jpg",
      desc: `Yangzhou style fried rice, serving with bean and pickles `,
    },
    {
      id: 6,
      title: "Onigiri",
      category: "Japan",
      price: 9.99,
      img:
        "https://www.manusmenu.com/wp-content/uploads/2017/08/Onigiri-3-1-of-1.jpg",
      desc: `Rice Sandwich, serving with soy sauce`,
    },
    {
      id: 7,
      title: "Jajangmyeon",
      category: "Korea",
      price: 15.99,
      img:
        "https://www.curiouscuisiniere.com/wp-content/uploads/2020/04/Jajangmyeon-Korean-Noodles-in-Black-Bean-Sauce5.1200H-720x540.jpg",
      desc: `Black bean sauce noodle, serving with green onion `,
    },
    {
      id: 8,
      title: "Ma Yi Shang Shu",
      category: "China",
      price: 12.99,
      img:
        "https://assets.tmecosys.com/image/upload/t_web767x639/img/recipe/ras/Assets/F688C2F6-86EC-46C4-B9C7-A6BA01DF7437/Derivates/32E3E72A-F786-406D-AF7F-B30980A9AC6C.jpg",
      desc: `Hot pepper sauce noodle, serving with soy bean and onion`,
    },
    {
      id: 9,
      title: "Doroyaki",
      category: "Japan",
      price: 3.99,
      img:
        "https://www.justonecookbook.com/wp-content/uploads/2011/10/Dorayaki-New-500x400.jpg",
      desc: `Red bean paste dessert, serving with honey.`,
    },
  ];

//button operations

function createButton(name = "All") {
  const button = document.createElement('button');
  button.classList.add('btn', 'btn-outline-dark', 'btn-item');
  button.innerText = name;
  button.onclick = changeMenu;
  return button;
};

const buttonContainer = document.querySelector('.btn-container');
let uniqueCategory = [...new Set(menu.map(element => element.category))];
uniqueCategory.unshift("All");

uniqueCategory.map(category => buttonContainer.append(createButton(category)));

//menu-items

function createItems(item) {
  let items = `
  <div class="menu-items col-lg-6 col-sm-12">
    <img src=${item.img}" alt=${item.title} class="photo">
      <div class="menu-info">
        <div class="menu-title">
          <h4>${item.title}</h4>
          <h4 class="price">${item.price}</h4>
        </div>
      <div class="menu-text">
      ${item.desc}
      </div>
    </div>
</div>`
  return items;
};

const sectionDOM = document.querySelector(".row");

menu.forEach(menu => {
  sectionDOM.innerHTML += createItems(menu);
});

function changeMenu() {
  sectionDOM.innerHTML = "";
  if (this.innerText === "All") {
    menu.forEach(menu => {
      sectionDOM.innerHTML += createItems(menu);
    });
  }
  else {
    let filter = menu.filter(element => element.category === this.innerText);

    filter.forEach(menu => {
      sectionDOM.innerHTML += createItems(menu);
    });
  };
};