如何在数组中找到具有特定扩展名的文件名

function findFilesWithExtension(fileNames, targetExtension) {
  const result = [];

  for (let i = 0; i < fileNames.length; i++) {
    const fileName = fileNames[i];
    const fileExtension = fileName.substring(fileName.lastIndexOf('.') + 1);

    if (fileExtension === targetExtension) {
      result.push(fileName);
    }
  }

  return result;
}

const fileNames = ['file1.txt', 'file2.jpg', 'file3.mp3', 'file4.png'];
const targetExtension = 'jpg';
const filesWithExtension = findFilesWithExtension(fileNames, targetExtension);

console.log(filesWithExtension);