如何添加对象值的总和并合并数组对象？

Question

我有一个包含嵌套对象的数组，想要添加值的总和并在 javascript 中创建一个对象。

const arr = [
{
  preliminary: {
    contract_value: 1000,
    planned_value: 500,
    balance_value: 500,
  },
  substructure: {
    contract_value: 1000,
    planned_value: 500,
    balance_value: 500,
  },
  superstructure: {
    contract_value: 1000,
    planned_value: 500,
    balance_value: 500,
  },
  architectural: {
    contract_value: 1000,
    planned_value: 500,
    balance_value: 500,
  },
  mande: {
    contract_value: 1000,
    planned_value: 500,
    balance_value: 500,
  },
  externalwork: {
    contract_value: 1000,
    planned_value: 500,
    balance_value: 500,
  },
  miscorcontingency: {
    contract_value: 1000,
    planned_value: 500,
    balance_value: 500,
  },
},
{
  preliminary: {
    contract_value: 100,
    planned_value: 50,
    balance_value: 50,
  },
  substructure: {
    contract_value: 100,
    planned_value: 50,
    balance_value: 50,
  },
  superstructure: {
    contract_value: 100,
    planned_value: 50,
    balance_value: 50,
  },
  architectural: {
    contract_value: 100,
    planned_value: 50,
    balance_value: 50,
  },
  mande: {
    contract_value: 100,
    planned_value: 50,
    balance_value: 50,
  },
  externalwork: {
    contract_value: 100,
    planned_value: 50,
    balance_value: 50,
  },
  miscorcontingency: {
    contract_value: 100,
    planned_value: 50,
    balance_value: 50,
  },
},

];

我已经为一个对象做了，所以想要做多个对象

const result = arr.reduce(
(obj, { preliminary, ...rest }) => {
  return (
    Object.keys(preliminary).map(
      (key) =>
        (obj.preliminary[key] =
          preliminary[key] + (Number(obj.preliminary[key]) || 0))
    ),
    obj
  );
},
{
  preliminary: {},
  substructure: {},
  superstructure: {},
  architectural: {},
  mande: {},
  externalwork: {},
  miscorcontingency: {},
}

);

console.log(结果)

这里附上小提琴link

我出于“初步”价值而出局。我需要所有的对象意味着需要动态地做。提前致谢。

Answer 1

我们可以多次使用Array.reduce()结合Object.entries()在结构中添加正确层级的属性，最终结果应该符合要求：

const arr = [ { preliminary: { contract_value: 1000, planned_value: 500, balance_value: 500, }, substructure: { contract_value: 1000, planned_value: 500, balance_value: 500, }, superstructure: { contract_value: 1000, planned_value: 500, balance_value: 500, }, architectural: { contract_value: 1000, planned_value: 500, balance_value: 500, }, mande: { contract_value: 1000, planned_value: 500, balance_value: 500, }, externalwork: { contract_value: 1000, planned_value: 500, balance_value: 500, }, miscorcontingency: { contract_value: 1000, planned_value: 500, balance_value: 500, }, }, { preliminary: { contract_value: 100, planned_value: 50, balance_value: 50, }, substructure: { contract_value: 100, planned_value: 50, balance_value: 50, }, superstructure: { contract_value: 100, planned_value: 50, balance_value: 50, }, architectural: { contract_value: 100, planned_value: 50, balance_value: 50, }, mande: { contract_value: 100, planned_value: 50, balance_value: 50, }, externalwork: { contract_value: 100, planned_value: 50, balance_value: 50, }, miscorcontingency: { contract_value: 100, planned_value: 50, balance_value: 50, }, }]

const result = arr.reduce((acc, cur) => {
    return Object.entries(cur).reduce((acc, [key1, val1]) => {
        return Object.entries(val1).reduce((acc, [key2, val2]) => {
            acc[key1] = acc[key1] || {}; 
            acc[key1][key2] = (acc[key1][key2] || 0) + val2;
            return acc;
        }, acc)
    }, acc)
}, {})

console.log('Result:',result)
    

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

这是我的解决方案：

const arr = [
  { preliminary: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    substructure: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    superstructure: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    architectural: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    mande: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    externalwork: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    miscorcontingency: { contract_value: 1000, planned_value: 500, balance_value: 500 }
  },
  {
    preliminary: { contract_value: 100, planned_value: 50, balance_value: 50 },
    substructure: { contract_value: 100, planned_value: 50, balance_value: 50 },
    superstructure: { contract_value: 100, planned_value: 50, balance_value: 50 },
    architectural: { contract_value: 100, planned_value: 50, balance_value: 50 },
    mande: { contract_value: 100, planned_value: 50, balance_value: 50 },
    externalwork: { contract_value: 100, planned_value: 50, balance_value: 50 },
    miscorcontingency: { contract_value: 100, planned_value: 50, balance_value: 50 }
  }
];

let result = arr.reduce((out, cv, ci)=>{
    if(ci == 0) return out;

    Object.keys(cv).forEach(key => {
        Object.keys(cv[key]).forEach(key2 => {
            (out[key] ??= {})[key2] += cv[key][key2];
        })
    });

    return out;

}, arr[0] );

console.log(result)

Answer 3

• 使用Array#reduce，在更新对象累加器的同时迭代数组
  • 在每次迭代中，使用Object#keys，迭代手头对象的键
    • 将prev 设置为保存在累加器中的键的值（如果存在），并将current 设置为手头对象中的值
    • 如果在累加器中没有为该键保存以前的值，请将对象设置为它
    • 否则，使用 Object#keys 和 Array#forEach 迭代其键并更新累加器

const arr = [
  { preliminary: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    substructure: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    superstructure: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    architectural: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    mande: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    externalwork: { contract_value: 1000, planned_value: 500, balance_value: 500 },
    miscorcontingency: { contract_value: 1000, planned_value: 500, balance_value: 500 }
  },
  {
    preliminary: { contract_value: 100, planned_value: 50, balance_value: 50 },
    substructure: { contract_value: 100, planned_value: 50, balance_value: 50 },
    superstructure: { contract_value: 100, planned_value: 50, balance_value: 50 },
    architectural: { contract_value: 100, planned_value: 50, balance_value: 50 },
    mande: { contract_value: 100, planned_value: 50, balance_value: 50 },
    externalwork: { contract_value: 100, planned_value: 50, balance_value: 50 },
    miscorcontingency: { contract_value: 100, planned_value: 50, balance_value: 50 }
  }
];

const res = arr.reduce((acc, obj) => {
  Object.keys(obj).forEach(key => {
    const prev = acc[key], current = obj[key];
    if(!prev) acc[key] = current;
    else Object.keys(current).forEach(k => prev[k] = (prev[k] || 0) + current[k]);
  });
  return acc;
}, {});

console.log(res);

Answer 4

const arr = [
    {
      preliminary: {
        contract_value: 1000,
        planned_value: 500,
        balance_value: 500,
      },
      substructure: {
        contract_value: 1000,
        planned_value: 500,
        balance_value: 500,
      },
      superstructure: {
        contract_value: 1000,
        planned_value: 500,
        balance_value: 500,
      },
      architectural: {
        contract_value: 1000,
        planned_value: 500,
        balance_value: 500,
      },
      mande: {
        contract_value: 1000,
        planned_value: 500,
        balance_value: 500,
      },
      externalwork: {
        contract_value: 1000,
        planned_value: 500,
        balance_value: 500,
      },
      miscorcontingency: {
        contract_value: 1000,
        planned_value: 500,
        balance_value: 500,
      },
      total: {
        contract_value: "7000.00",
        planned_value: "3500.00",
        balance_value: "3500.00",
      },
    },
    {
      preliminary: {
        contract_value: 100,
        planned_value: 50,
        balance_value: 50,
      },
      substructure: {
        contract_value: 100,
        planned_value: 50,
        balance_value: 50,
      },
      superstructure: {
        contract_value: 100,
        planned_value: 50,
        balance_value: 50,
      },
      architectural: {
        contract_value: 100,
        planned_value: 50,
        balance_value: 50,
      },
      mande: {
        contract_value: 100,
        planned_value: 50,
        balance_value: 50,
      },
      externalwork: {
        contract_value: 100,
        planned_value: 50,
        balance_value: 50,
      },
      miscorcontingency: {
        contract_value: 100,
        planned_value: 50,
        balance_value: 50,
      },
      total: {
        contract_value: "700.00",
        planned_value: "350.00",
        balance_value: "350.00",
      },
    },
  ];
  

const result = arr.reduce((obj, outerKeys) => {
  Object.keys(outerKeys).map((outerKey) => {
    // console.log(`outerKey:::`, outerKey);
    // console.log(`values[outerKey]:::`, outerKeys[outerKey]);
    // console.log(`obj:::`, obj);
    if (obj[outerKey]) {
      const tempObject = outerKeys[outerKey];
      Object.keys(tempObject).map((objKey) => {
        const tempInnerObject = obj[outerKey];
        tempInnerObject[objKey] =
          Number(tempInnerObject[objKey]) + Number(tempObject[objKey]);
        // console.log(`objKey:::`, objKey);
        // console.log(`tempObject[objKey]:::`, tempObject[objKey]);
      });
    } else {
      obj[outerKey] = outerKeys[outerKey];
    }
  });
  return obj;
}, {});
console.log(`result :::`, result);