Javascript根据更大的日期键从数组中删除对象

Question

我有一个像这样的数组 -

"formats": [
{
    "format": "eBook",
    "published": "3/3/2014",
    "id": "1234"
},
{
    "format": "Paperback",
    "published": "19/3/2020",
    "id": "123"
},
{
    "format": "eBook",
    "published": "19/3/2020",
    "id": "12345"
}]

我想写一个js过滤函数，它应该根据最新的格式返回我。所以像这样的

"formats": [
{
    "format": "Paperback",
    "published": "19/3/2020",
    "id": "123"
},
{
    "format": "eBook",
    "published": "19/3/2020",
    "id": "12345"
}]

其中 ID 为 1234 的对象被删除，因为具有相同格式的另一个对象(电子书)具有更长的发布日期。

我尝试使用 JS 的过滤功能，但不知何故我把它搞砸了。

Answer 1

const formats = [
{
    "format": "eBook",
    "published": "3/3/2014",
    "id": "1234"
},
{
    "format": "Paperback",
    "published": "27/3/2020",
    "id": "123"
},
{
    "format": "Paperback",
    "published": "19/3/2020",
    "id": "123"
},
{
    "format": "eBook",
    "published": "19/3/2020",
    "id": "12345"
}];

function filterFormats(formats){
    const toTime = (date) => new Date(date.replace(/(\d+)\/(\d+)\/(\d+)/, "$2/$1/$3")).getTime();
    const data = formats.reduce((a, b) => {
      if(b.format+'' in a && toTime(a[b.format].published) > toTime(b.published)) return a;
      a[b.format] = b;
      return a;
    }, {});
    return Object.values(data);
}

console.log(filterFormats(formats));