如何在javascript中动态地按数组值分组

function groupByValue(arr) {
  return arr.reduce((result, value) => {
    if (!result[value]) {
      result[value] = [];
    }
    result[value].push(value);
    return result;
  }, {});
}

const array = [1, 2, 2, 3, 3, 3, 4, 5];
const grouped = groupByValue(array);
console.log(grouped);

function groupByValue(arr) {
  const map = new Map();
  arr.forEach(value => {
    if (!map.has(value)) {
      map.set(value, []);
    }
    map.get(value).push(value);
  });
  return Object.fromEntries(map);
}

const array = [1, 2, 2, 3, 3, 3, 4, 5];
const grouped = groupByValue(array);
console.log(grouped);

function groupByValue(arr) {
  const grouped = {};
  arr.forEach(value => {
    if (!grouped[value]) {
      grouped[value] = [];
    }
    grouped[value].push(value);
  });
  return grouped;
}

const array = [1, 2, 2, 3, 3, 3, 4, 5];
const grouped = groupByValue(array);
console.log(grouped);