javascript - 合并不同长度的对象

Question

我有一个对象数组，以日期字符串为键，布局如下:

[
    {
        '2017-08-21': {row: 0, artind: 25, qind: 20}, 
        '2017-08-22': {row: 1, artind: 5, qind: 12}, 
        '2017-08-23': {row: 11, artind: 3, qind: 0}, 
        '2017-08-24': {row: 45, artind: 25, qind: 43}, 
        '2017-08-25': {row: 13, artind: 0, qind: 27}, 
        '2017-08-26': {row: 2, artind: 2, qind: 2}, 
        '2017-08-27': {row: 1, artind: 12, qind: 27}, 
        '2017-08-28': {row: 19, artind: 0, qind: 0}, 
        '2017-08-29': {row: 11, artind: 25, qind: 7}
    },
    {
        '2017-08-24': {row: 1, artind: 34, qind: 8}, 
        '2017-08-25': {row: 0, artind: 5, qind: 3}, 
        '2017-08-26': {row: 7, artind: 22, qind: 0}
    },
    {
        '2017-08-22': {row: 55, artind: 5, qind: 2}, 
        '2017-08-23': {row: 13, artind: 25, qind: 0}, 
        '2017-08-24': {row: 1, artind: 0, qind: 0}, 
        '2017-08-25': {row: 6, artind: 8, qind: 0}, 
        '2017-08-26': {row: 0, artind: 12, qind: 89}, 
        '2017-08-27': {row: 11, artind: 29, qind: 5}
    }
]

我需要对每个对象中的所有值求和。所以最后，我需要一个看起来像这样的对象:

{
    '2017-08-21': {row: 0, artind: 25, qind: 20}, 
    '2017-08-22': {row: 56, artind: 10, qind: 14}, 
    '2017-08-23': {row: 24, artind: 28, qind: 0}, 
    '2017-08-24': {row: 47, artind: 59, qind: 51}, 
    '2017-08-25': {row: 19, artind: 13, qind: 30}, 
    '2017-08-26': {row: 9, artind: 36, qind: 91}, 
    '2017-08-27': {row: 12, artind: 41, qind: 32}, 
    '2017-08-28': {row: 19, artind: 0, qind: 0}, 
    '2017-08-29': {row: 11, artind: 25, qind: 7}
}

我真正用于支持的唯一库是 underscore.js，所以非常感谢这些答案!

谢谢

Answer 1

您可以使用下面的 reduce 方法来解决您的问题。

const a = [{
  '2017-08-21': { row: 0, artind: 25, qind: 20 },
  '2017-08-22': { row: 1, artind: 5, qind: 12 },
  '2017-08-23': { row: 11, artind: 3, qind: 0 },
  '2017-08-24': { row: 45, artind: 25, qind: 43 },
  '2017-08-25': { row: 13, artind: 0, qind: 27 },
  '2017-08-26': { row: 2, artind: 2, qind: 2 },
  '2017-08-27': { row: 1, artind: 12, qind: 27 },
  '2017-08-28': { row: 19, artind: 0, qind: 0 },
  '2017-08-29': { row: 11, artind: 25, qind: 7 }
},
{
  '2017-08-24': { row: 1, artind: 34, qind: 8 },
  '2017-08-25': { row: 0, artind: 5, qind: 3 },
  '2017-08-26': { row: 7, artind: 22, qind: 0 }
},
{
  '2017-08-22': { row: 55, artind: 5, qind: 2 },
  '2017-08-23': { row: 13, artind: 25, qind: 0 },
  '2017-08-24': { row: 1, artind: 0, qind: 0 },
  '2017-08-25': { row: 6, artind: 8, qind: 0 },
  '2017-08-26': { row: 0, artind: 12, qind: 89 },
  '2017-08-27': { row: 11, artind: 29, qind: 5 }
}];

a.reduce((result, item) => {
  Object.keys(item).forEach((key) => {
    if (result[key]) {
      result[key] = {
        row: result[key].row + item[key].row,
        artind: result[key].artind + item[key].artind,
        qind: result[key].qind + item[key].qind };
    } else {
      result[key] = item[key];
    }
  });
  return result;
}, {});

编辑:只是格式化