如何分组和对象数组？ [英] how to group by and sum array of object?

问题描述

我想按ID分组数组，并在Jquery中按数量求和？
例如：

I would like to Group Object of Array by Id and sum by quantity in Jquery? For example:

var array=[
{Id:"001",qty:1},
{Id:"002",qty:2},
{Id:"001",qty:2},
{Id:"003",qty:4}
]

我按照Id对它进行分组后，我会得到新的数组：

After I Group it by the Id I will get the new Array like:

  [   
    {Id:"001",qty:3},
    {Id:"002",qty:2},
    {Id:"003",qty:4}
    ]

推荐答案

你可以循环并总结它

var array = [
  { Id: "001", qty: 1 }, 
  { Id: "002", qty: 2 }, 
  { Id: "001", qty: 2 }, 
  { Id: "003", qty: 4 }
];

var result = [];
array.reduce(function(res, value) {
  if (!res[value.Id]) {
    res[value.Id] = { Id: value.Id, qty: 0 };
    result.push(res[value.Id])
  }
  res[value.Id].qty += value.qty;
  return res;
}, {});

console.log(result)

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