如何在Angular 4或5中按数组分组? [英] how to Group By Array in Angular 4 OR 5?

问题描述

我得到了这种类型的数组，我只想按整个数组中的一列( first_name )分组

i got this type of array, and i want to group by only one column (first_name) from whole array,

[
   {
     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", 
   }
]

那么我如何从"组件"中按此数组分组?

so how can i group by this array from "component"?

推荐答案

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);

这篇关于如何在Angular 4或5中按数组分组?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！