Arrays 如何按角度为4或5的数组分组？

我得到了这种类型的数组，我只想从整个数组中按一列（first_name）分组

[
   {
     first_name: "Apurv",
     date: "2018-01-22",
     is_present: "1", 
   }
   {
     first_name: "Lucky",
     date: "2018-01-22",
     is_present: "0", 
   }
   {
     first_name: "Apurv",
     date: "2018-01-20",
     is_present: "0", 
   }
   {
     first_name: "Lucky",
     date: "2018-01-20",
     is_present: "1", 
   }
]

---

那么，我如何根据这个数组从“组件”“？

分组是什么意思？@AyushGupta我不想重复“first_name”，你可以看到在上面的数组中first_name是重复的。。请注意，这与角度无关。这是一个纯JavaScript问题。从两个相同的名称来看，是否要显示第一条记录？o需要从这两个数组中选择一个条件？@Nestor我需要两个数组记录，但只需要一次“first_name”。

var data = [
   {
     first_name: "Apurv",
     date: "2018-01-22",
     is_present: "1", 
   },
   {
     first_name: "Lucky",
     date: "2018-01-22",
     is_present: "0", 
   },
   {
     first_name: "Apurv",
     date: "2018-01-20",
     is_present: "0", 
   },
   {
     first_name: "Lucky",
     date: "2018-01-20",
     is_present: "1", 
   }
];

var groupByName = {};

data.forEach(function (a) {
    groupByName [a.first_name] = groupByName [a.first_name] || [];
    groupByName [a.first_name].push({ date: a.date, is_present: a.is_present });
});

console.log(groupByName);