12. 整数转罗马数字

我的回答（半小时内没有回答出来）

很感慨，leetCode上用while比较频繁，而我工作中几乎没用过，所以很难去想起它

function intToRoman(num: number): string {
  let str = "";
  const romaMap = new Map([
   [1000, "M"],
    [900, "CM"],
    [500, "D"],
    [400, "CD"],
    [100, "C"],
    [90, "XC"],
    [50, "L"],
    [40, "XL"],
    [10, "X"],
    [9, "IX"],
    [5, "V"],
    [4, "IV"],
    [1, "I"],
  ]);


  romaMap.forEach((value,key)=>{
    if (num >= key) {
      num-=key
    }
    str+=key
  })

  return str;
}

console.log(intToRoman(3));

其他回答

function intToRoman(num: number): string {
  let str = "";
  const romaList = [
    [1000, "M"],
    [900, "CM"],
    [500, "D"],
    [400, "CD"],
    [100, "C"],
    [90, "XC"],
    [50, "L"],
    [40, "XL"],
    [10, "X"],
    [9, "IX"],
    [5, "V"],
    [4, "IV"],
    [1, "I"],
  ];
  for (const [key, value] of romaList) {
    while (num >= +key) {
      num -= +key;
      str += value;
    }
    if (num === 0) break;
  }

  return str;
}