【算法题】字符串排序（js）

const str = "Hello hello world";
const str1 = "i LOVE Cc I love CC Hello Hel Hellow";
function solution(str) {
  const arr = str.split(" ").sort((a, b) => {
    const aUpper = a.toUpperCase();
    const bUpper = b.toUpperCase();
    return aUpper === bUpper ? 0 : aUpper > bUpper ? 1 : -1;
  });
  const stack = [arr[0]];
  for (let i = 1; i < arr.length; i++) {
    if (stack[stack.length - 1].toUpperCase() !== arr[i].toUpperCase()) {
      stack.push(arr[i]);
    }
  }
  return stack.join(" ");
}

console.log(solution(str));
/* 
Hello hello world  => Hello world
i LOVE Cc I love CC Hello Hel Hellow => Cc Hel Hello Hellow i LOVE
 */