遍历对象数组 - Javascript答案

【问题标题】：Iterating through an array of Objects - Javascript遍历对象数组 - Javascript
【发布时间】：2018-07-31 10:49:39
【问题描述】：

// Hi, I am having following array of data
const MyCorp = [{
    firstName: "ABC Corp",
    ownShareholders: true,
    percentageOwnership: 50,
    shareholders: [{
        firstName: "XYZ Corp",
        percentageOwnership: 50,
        ownShareholders: false,
        shareholders: []
      },
      {
        firstName: "DEF Corp",
        ownShareholders: true,
        percentageOwnership: 60,
        shareholders: [{
            firstName: "SAY Corp",
            percentageOwnership: 50,
            ownShareholders: false,
            shareholders: []
          },
          {
            firstName: "No Corp",
            ownShareholders: false,
            percentageOwnership: 50,
            shareholders: []
          }
        ]
      }
    ]
  },
  {
    firstName: "Test Corp",
    ownShareholders: false,
    shareholders: [],
    percentageOwnership: 50
  }
]

// A trying to iterate over the data to get below output

// MyCorp share value = 50+ 50 == 100 (50 is from ABC Corp and  50 is of Test Corp)
// ABC Corp share value = 50 + 60 ===110(50 is from XYZ Corp and  60 is of DEF Corp)
// DEF Corp Share value = 50+ 50 === 100(50 is from SAY Corp and 50 is of No Corp)
// Output can be a object or array

// What I did to achieve this 

const ShareArray = (shareholders) => {
  const something = [];
  shareholders.forEach((shareholder) => {
    if (shareholder.ownShareholders === true) {
      something.push(shareholder.shareholders);
    }
  });
  return validateSharePercentage(something[0])
};

const validateSharePercentage = shareholders => {
  let value = 0;
  shareholders.forEach(shareholder => {
    value += shareholder.percentageOwnership;
  });
  return value;
};
const somevalue = validateSharePercentage(MyCorp);
console.log(somevalue);
const arrayValues = ShareArray(MyCorp);
console.log(arrayValues);

我得到 100 和 110，但不知道如何遍历所有子项并获得单个公司的总股票价值

子股东可能会根据用户需求增长 - 似乎我需要实现递归函数，但我也未能实现请帮忙... 谢谢

【问题讨论】：

标签： javascript

【解决方案1】：

我将 MyCorp 添加到相同的结构中（名字、ownShareholders、percentageOwnership、股东）

const MyCorp = [{
    firstName: 'MyCorp',
    ownShareholders: true,
    shareholders: [{
        firstName: 'ABC Corp',
        ownShareholders: true,
        percentageOwnership: 50,
        shareholders: [{
            firstName: 'XYZ Corp',
            percentageOwnership: 50,
            ownShareholders: false,
            shareholders: []
        },
        {
            firstName: 'DEF Corp',
            ownShareholders: true,
            percentageOwnership: 60,
            shareholders: [{
                firstName: 'SAY Corp',
                percentageOwnership: 50,
                ownShareholders: false,
                shareholders: []
            },
            {
                firstName: 'No Corp',
                ownShareholders: false,
                percentageOwnership: 50,
                shareholders: []
            }
            ]
        }
        ]
    },
    {
        firstName: 'Test Corp',
        ownShareholders: false,
        shareholders: [],
        percentageOwnership: 50
    }
    ]
}];

const getShareValue = (comp) => comp.reduce((result, current) => result += current.percentageOwnership, 0);

const calc = (comp) => {
    let result = {};
    comp.forEach((current) => {
        if (current.ownShareholders) {
            result = Object.assign(result, calc(current.shareholders));
            result[current.firstName] = getShareValue(current.shareholders);
        }
    });

    return result;
};

console.log(calc(MyCorp));

【讨论】：

【解决方案2】：

您可以首先将MyCorp 数组放入一个新数组中，其中包含一个带有firstName 和shareholders 的对象，就像其余数据一样，这样您就可以使用递归算法。

那么只需要收集每个股东的percentageOwnership，并在shareholders数组上递归调用函数即可。

示例

const MyCorp = [
  {
    firstName: "ABC Corp",
    ownShareholders: true,
    percentageOwnership: 50,
    shareholders: [
      {
        firstName: "XYZ Corp",
        percentageOwnership: 50,
        ownShareholders: false,
        shareholders: []
      },
      {
        firstName: "DEF Corp",
        ownShareholders: true,
        percentageOwnership: 60,
        shareholders: [
          {
            firstName: "SAY Corp",
            percentageOwnership: 50,
            ownShareholders: false,
            shareholders: []
          },
          {
            firstName: "No Corp",
            ownShareholders: false,
            percentageOwnership: 50,
            shareholders: []
          }
        ]
      }
    ]
  },
  {
    firstName: "Test Corp",
    ownShareholders: false,
    shareholders: [],
    percentageOwnership: 50
  }
];

const data = [
  {
    firstName: "MyCorp",
    shareholders: MyCorp
  }
];

const result = data.reduce(function getPercentageOwnership(result, element) {
  const { firstName } = element;

  if (element.shareholders.length !== 0) {
    result[firstName] = 0;
  }
  element.shareholders.forEach(shareholder => {
    result[firstName] += shareholder.percentageOwnership;
    getPercentageOwnership(result, shareholder);
  });

  return result;
}, {});

console.log(result);

【讨论】：