如何将JSON对象与相同的键组合并添加其他对应的值? [英] How to combine JSON object with same key and add their other corresponding values?

问题描述

我尝试了以下代码.

var SeatWithCat = [{
  "level": "Level II",
  "price": 5,
  "quantity": 1,
  "seats": "B3"
}, {
  "level": "Level II",
  "price": 5,
  "quantity": 1,
  "seats": "B1"
}, {
  "level": "Level I",
  "price": 10,
  "quantity": 1,
  "seats": "A2"
}, {
  "level": "Level III",
  "price": 30,
  "quantity": 1,
  "seats": "C1"
}, {
  "level": "Level III",
  "price": 30,
  "quantity": 1,
  "seats": "C2"
}, {
  "level": "Level V",
  "price": 50,
  "quantity": 1,
  "seats": "E1"
}, {
  "level": "Level II",
  "price": 5,
  "quantity": 1,
  "seats": "B2"
}, {
  "level": "Level VI",
  "price": 2,
  "quantity": 1,
  "seats": "F1"
}];
var temp = [];
var jsonarr = [];
for (var i = 0; i < SeatWithCat.length; i++) {
  for (var j = 1; j < SeatWithCat.length; j++) {
    if (SeatWithCat[i].level === SeatWithCat[j].level) {
      temp.push({
        level: SeatWithCat[i].level,
        quantity: SeatWithCat[i].quantity + SeatWithCat[j].quantity,
        price: SeatWithCat[i].price + SeatWithCat[j].price,
        seats: SeatWithCat[i].seats + "," + SeatWithCat[j].seats
      });
      SeatWithCat = SeatWithCat.filter(function(el) {
        return el.level !== SeatWithCat[i].level;
      });
      jsonarr = SeatWithCat;
      alert(JSON.stringify(temp));
    }
  }
}
var finalObj = temp.concat(jsonarr);
alert(JSON.stringify(finalObj));

输出:

[{
  "level": "Level II",
  "quantity": 2,
  "price": 10,
  "seats": "B3,B1"
}, {
  "level": "Level III",
  "quantity": 2,
  "price": 60,
  "seats": "C1,C1"
}, {
  "level": "Level VI",
  "quantity": 2,
  "price": 4,
  "seats": "F1,F1"
}, {
  "level": "Level I",
  "price": 10,
  "quantity": 1,
  "seats": "A2"
}, {
  "level": "Level V",
  "price": 50,
  "quantity": 1,
  "seats": "E1"
}]

对于具有相同级别的两个对象，它工作正常，但是，如果在相同级别的数组中有两个以上的对象，则它不起作用.我的要求是为具有相同级别的任意数量的对象添加值. 预先感谢！

It's Working fine for two objects having same level but if there are greater than two objects in the array with same level its not working. My requirement is to add values for any number of objects having same level. Thanks in advance!

推荐答案

您可以使用Array.prototype.reduce()收集字典中的唯一项，然后使用Array.prototype.map()将字典转换回数组:

You can use Array.prototype.reduce() to collect unique items in an dictionary, and then transform the dictionary back to array using Array.prototype.map():

function combine(arr) {
  var combined = arr.reduce(function(result, item) {
    var current = result[item.level];

    result[item.level] = !current ? item : {
      level: item.level,
      price: current.price + item.price,
      quantity: current.quantity + item.quantity,
      seats: current.seats + ',' + item.seats
    };

    return result;
  }, {});

  return Object.keys(combined).map(function(key) {
    return combined[key];
  });
}

var SeatWithCat = [{"level":"Level II","price":5,"quantity":1,"seats":"B3"},{"level":"Level II","price":5,"quantity":1,"seats":"B1"},{"level":"Level I","price":10,"quantity":1,"seats":"A2"},{"level":"Level III","price":30,"quantity":1,"seats":"C1"},{"level":"Level III","price":30,"quantity":1,"seats":"C2"},{"level":"Level V","price":50,"quantity":1,"seats":"E1"},{"level":"Level II","price":5,"quantity":1,"seats":"B2"},{"level":"Level VI","price":2,"quantity":1,"seats":"F1"}];

var result = combine(SeatWithCat);

console.log(result);

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