从数组中查找最后一个大写单词

function findLastUppercaseWord(arr) {
  let lastUppercaseWord = null;
  
  for (let i = 0; i < arr.length; i++) {
    const word = arr[i];
    
    // 判断是否为单词
    if (/^[A-Z][a-zA-Z]*$/.test(word)) {
      lastUppercaseWord = word;
    }
  }
  
  return lastUppercaseWord;
}

const array = ["hello", "World", "foo", "BAR"];
const lastUppercaseWord = findLastUppercaseWord(array);
console.log(lastUppercaseWord);  // 输出 "BAR"