如何从数组中选择成组，修改并重新添加到它们的位置

// 原始数组
const originalArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

// 选择条件：偶数
const condition = (num) => num % 2 === 0;

// 分组和修改
const modifiedGroups = [];
let currentGroup = [];
originalArray.forEach((num) => {
  if (condition(num)) {
    currentGroup.push(num * 2); // 修改：将偶数乘以2
  } else {
    if (currentGroup.length > 0) {
      modifiedGroups.push(currentGroup);
      currentGroup = [];
    }
    modifiedGroups.push([num]);
  }
});
if (currentGroup.length > 0) {
  modifiedGroups.push(currentGroup);
}

// 重新添加到原始数组的位置
let index = 0;
modifiedGroups.forEach((group) => {
  originalArray.splice(index, group.length, ...group);
  index += group.length;
});

console.log(originalArray); // 输出：[1, 4, 3, 8, 5, 12, 7, 16, 9, 20]