请问，想要忽略大小写，请问应该如何优化此代码呢？

Question

// 搜索方法
  function searchKeys(searchParam: string): string[] {
    const keys: string[] = Object.keys(searchData).filter((key: string) => {
      const keywords: string[] = searchData[key];
      return keywords.some((keyword: string) => keyword.includes(searchParam));
    });

    return keys;
  }

请问，想要忽略大小写，请问应该如何优化呢？

Answer 1

function searchKeys(searchParam: string): string[] {
  const loweredSearchParam = searchParam.toLowerCase();

  const keys: string[] = Object.keys(searchData).filter((key: string) => {
    const keywords: string[] = searchData[key];
    return keywords.some((keyword: string) => keyword.toLowerCase().includes(loweredSearchParam));
  });

  return keys;
}