想要使用javascript或jquery对对象中具有相同属性名称的值求和 [英] Want to sum of values with same property name in object using javascript or jquery

问题描述

您好，我想为每个原因名称计算数量的总和.我有以下两个数组.

Hi I want to do sum of the quantity for each reason name.And I have 2 arrays as per below.

var allreasonsids=[];
 allreasonsids = [
   {reasonid: 1, reasonname: abc}, 
   {reasonid: 2, reasonname: def}, 
   {reasonid: 3, reasonname: ghi}, 
   {reasonid: 4, reasonname: jkl}
];


var reasonsandcount=[];
reasonsandcount=[
{reasonid: 1, quantity: 5},
{reasonid: 2, quantity: 10},
{reasonid: 1, quantity: 3},
{reasonid: 3, quantity: 4},
{reasonid: 1, quantity: 2},
{reasonid: 2, quantity: 6}
];

我希望得到如下结果:

输出: abc:10

def:16

ghi:4

jkl:0

请给我任何答案. 谢谢.

Please suggest me any answer. Thank You.

推荐答案

使用Array.prototype.reduce，Object.keys和Array.prototype.forEach函数的解决方案:

The solution using Array.prototype.reduce, Object.keys and Array.prototype.forEach functions:

var allreasonsids = [{reasonid: 1, reasonname: 'abc'}, {reasonid: 2, reasonname: 'def'}, {reasonid: 3, reasonname: 'ghi'}, {reasonid: 4, reasonname: 'jkl'}],
    reasonsandcount = [{reasonid: 1, quantity: 5},{reasonid: 2, quantity: 10},{reasonid: 1, quantity: 3},{reasonid: 3, quantity: 4},{reasonid: 1, quantity: 2},{reasonid: 2, quantity: 6}];

// getting sums for grouped `reasonid` items
var sums = reasonsandcount.reduce(function (a, b) {
  (a[b.reasonid]) ? a[b.reasonid] += b.quantity : a[b.reasonid] = b.quantity;
  return a;
}, {});

var result = {}, keys = Object.keys(sums);
allreasonsids.forEach(function (o) {
    this[o.reasonname] = (keys.indexOf(o.reasonid + "") !== -1)? sums[o.reasonid] : 0;
}, result);

console.log(result);

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