js 怎么补上 空缺数字

function fillMissingNumbers(start, end) {
  return Array.from({ length: end - start + 1 }, (_, i) => start + i);
}

const filledArray = fillMissingNumbers(1, 10); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

function fillMissingNumbersInArray(arr) {
  const result = [];
  for (let i = Math.min(...arr); i <= Math.max(...arr); i++) {
    if (!result.includes(i)) {
      result.push(i);
    }
  }
  return result;
}

const arrayWithGaps = [1, 3, 4, 7, 9];
const filledArray = fillMissingNumbersInArray(arrayWithGaps); // [1, 2, 3, 4, 5, 6, 7, 8, 9]

function fillMissingNumbersInArray(arr) {
  return arr.reduce((acc, val) => {
    if (acc.length === 0 || acc[acc.length - 1] !== val - 1) {
      acc.push(val);
    }
    while (acc.length > 0 && acc[acc.length - 1] !== val - 1) {
      acc.push(val - 1);
    }
    acc.push(val);
    return acc;
  }, []);
}

const arrayWithGaps = [1, 3, 4, 7, 9];
const filledArray = fillMissingNumbersInArray(arrayWithGaps); // [1, 2, 3, 4, 5, 6, 7, 8, 9]