如何创建基于数组的唯一键？

Question

我有这样的日期范围，我想基于每个月创建数组。

1 => Thu Feb 16 2023
1 => Fri Feb 17 2023
1 => Sat Feb 18 2023
1 => Sun Feb 19 2023
1 => Mon Feb 20 2023
1 => Tue Feb 21 2023
1 => Wed Feb 22 2023
1 => Thu Feb 23 2023
1 => Fri Feb 24 2023
1 => Sat Feb 25 2023
1 => Sun Feb 26 2023
1 => Mon Feb 27 2023
1 => Tue Feb 28 2023
2 => Wed Mar 01 2023
2 => Thu Mar 02 2023
2 => Fri Mar 03 2023

我需要像这样的数组

1 => [Fri Feb 17 2023, Sat Feb 18 2023, ...],
2 => [Wed Mar 01 2023, Thu Mar 02 2023, ...]

这是我的代码

let dts = {};
newDates.forEach((dt, i) => {
  let mn = new Date(dt).getMonth();
  dts[mn] = dt;
});
console.log(dts);

我得到这样的结果

1 : Tue Feb 28 2023
2 : Fri Mar 03 2023

只得到最后一个元素。如何解决这个问题？谢谢

Answer 1

所以创建一个数组并推送它。

const dts = newDates.reduce((acc, dt) => {
  const mn = new Date(dt).getMonth();
  acc[mn] = acc[mn] || [];
  acc[mn].push(dt);
  return acc;
});