javascript - 合并两个对象数组，同时对特定键求和

Question

我有两个数组

array1 = [ {_id: { month: 9, year: 2015 },
    count: 1,
    sampleDate: Tue Sep 22 2015 20:04:46 GMT+0530 (IST),
    interactions: [ [Object] ],
    interactionsBySelf: 0,
    interactionsByTeam: 1 },
  { _id: { month: 10, year: 2015 },
    count: 5,
    sampleDate: Thu Oct 01 2015 18:08:24 GMT+0530 (IST),
    interactions: [ [Object], [Object], [Object], [Object], [Object] ],
    interactionsBySelf: 0,
    interactionsByTeam: 5 },
  { _id: { month: 11, year: 2015 }]

和

array2 = [ {_id: { month: 9, year: 2015 },
    count: 3,
    sampleDate: Tue Sep 22 2015 20:04:46 GMT+0530 (IST),
    interactions: [ [Object],[Object],[Object] ],
    interactionsBySelf: 0,
    interactionsByTeam: 1 },
  { _id: { month: 10, year: 2015 },
    count: 7,
    sampleDate: Thu Oct 01 2015 18:08:24 GMT+0530 (IST),
    interactions: [ [Object], [Object], [Object], [Object], [Object], [Object], [Object] ],
    interactionsBySelf: 0,
    interactionsByTeam: 5 },
  { _id: { month: 11, year: 2015 }]

如何合并这两个数组，使得结果数组为 其中计数和交互Byteam 相加并且交互合并。 _id 和sampleDate 保持不变

arrayResult = [{ _id: { month: 9, year: 2015 },
    count: 4,
    sampleDate: Tue Sep 22 2015 20:04:46 GMT+0530 (IST),
    interactions: [ [Object],[Object],[Object],[Object] ],
    interactionsBySelf: 0,
    interactionsByTeam: 4 },
  { _id: { month: 10, year: 2015 },
    count: 12,
    sampleDate: Thu Oct 01 2015 18:08:24 GMT+0530 (IST),
    interactions: [ [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object] ],
    interactionsBySelf: 0,
    interactionsByTeam: 12 },
  { _id: { month: 11, year: 2015 }]

Answer 1

这是一个与临时对象和 Array#forEach() 进行合并和计数的提案.

var array1 = [{ _id: { month: 9, year: 2015 }, count: 1, sampleDate: 'Tue Sep 22 2015 20:04:46 GMT+0530 (IST)', interactions: ['[Object1]'], interactionsBySelf: 0, interactionsByTeam: 1 }, { _id: { month: 10, year: 2015 }, count: 5, sampleDate: 'Thu Oct 01 2015 18:08:24 GMT+0530 (IST)', interactions: ['[Object2], [Object], [Object], [Object], [Object]'], interactionsBySelf: 0, interactionsByTeam: 5 }, { _id: { month: 11, year: 2015 } }],
    array2 = [{ _id: { month: 9, year: 2015 }, count: 3, sampleDate: 'Tue Sep 22 2015 20:04:46 GMT+0530 (IST)', interactions: ['[Object3],[Object],[Object]'], interactionsBySelf: 0, interactionsByTeam: 1 }, { _id: { month: 10, year: 2015 }, count: 7, sampleDate: 'Thu Oct 01 2015 18:08:24 GMT+0530 (IST)', interactions: ['[Object4], [Object], [Object], [Object], [Object], [Object], [Object]'], interactionsBySelf: 0, interactionsByTeam: 5 }, { _id: { month: 11, year: 2015 } }],
    result = function (array) {
        var o = {}, r = [];
        array.forEach(function (a) {
            var k = a._id.year + '|' + a._id.month;
            if (!(k in o)) {
                o[k] = {
                    _id: a._id,
                    count: 0,
                    sampleDate: a.sampleDate,
                    interactions: [],
                    interactionsBySelf: a.interactionsBySelf,
                    interactionsByTeam: 0
                };
                r.push(o[k]);
            }
            o[k].count += a.count;
            o[k].interactions = o[k].interactions.concat(a.interactions);
            o[k].interactionsByTeam += a.interactionsByTeam;
        });
        return r;
    }(array1.concat(array2));

document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');