Search Algorithm

const data = [
  "Danawi Liam",
  "Tarjaya",
  "Daruna",
  "Warsoni",
  "John Wick",
  "Hadi PS",
  "Derian Lekso"
];

function search (searchKey) {
  const searchResult = [...data].filter((item) => {
    if (item.toLowerCase().includes(searchKey)) {
      return item;
    }
  });
  return searchResult;
}

search('ar'); // ['Tarjaya', 'Daruna', 'Warsoni']