Question

这是我的用例：我有两个来自两个可观察对象的对象数组，我创建了一个CombineLatest方法，以使用映射的ID将数组迭代为一个对象：

var result1 = [{
    question: 1,
    answerList: [{
        answer: 'Sandra',
        isDefault: 'true'
      },
      {
        answer: 'John',
        isDefault: 'false'
      }
    ]
  },
  {
    question: 2,
    answerList: [{
        answer: 'Peter',
        isDefault: 'false'
      },
      {
        answer: 'Bobby',
        isDefault: 'false'
      }
    ]
  },
  {
    question: 3,
    answerList: [{
        answer: 'Harry',
        isDefault: 'false'
      },
      {
        answer: 'Bob',
        isDefault: 'false'
      }
    ]
  }
]

var result2 = [{
    question: 1,
    answer: 'John'
  },
  {
    question: 3,
    answer: 'Bob'
  }
];

我的目标是拥有另一个包含如下元素的对象数组：

var finalResult = [{
    question: 1,
    answerList: [{
        answer: 'Sandra',
        isDefault: 'false'
      },
      {
        answer: 'John',
        isDefault: 'true'
      }
    ]
  },
  {
    question: 2,
    answerList: [{
        answer: 'Peter',
        isDefault: 'false'
      },
      {
        answer: 'Bobby',
        isDefault: 'false'
      }
    ]
  },
  {
    question: 3,
    answerList: [{
        answer: 'Harry',
        isDefault: 'false'
      },
      {
        answer: 'Bob',
        isDefault: 'true'
      }
    ]
  }
]

Answer 1

您可以使用哈希表来更快地检查设置了答案的问题。然后根据对象的设置迭代和更新项目。

var result1 = [{ question: 1, answerList: [{ answer: 'Sandra', isDefault: 'true' }, { answer: 'John', isDefault: 'false' }] }, { question: 2, answerList: [{ answer: 'Peter', isDefault: 'false' }, { answer: 'Bobby', isDefault: 'false' }] }, { question: 3, answerList: [{ answer: 'Harry', isDefault: 'false' }, { answer: 'Bob', isDefault: 'false' }] }],
    result2 = [{ question: 1, answer: 'John' }, { question: 3, answer: 'Bob' }],
    object = result2.reduce((o, { question, answer }) => {
        (o[question] = o[question] || {})[answer] = true;
        return o;
    }, Object.create(null));

result1.forEach(({ question, answerList }) =>
    answerList.forEach(o => 
        o.isDefault = (question in object && o.answer in object[question]).toString()
    )
);

console.log(result1);

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

Answer 2

示例代码：

let result = result1.map(item => {
    let targetItems = result2.filter( item2 => item2.question === 
                      item.question );
    targetItems.forEach(item3 => {
        item.answerList.push(item3.answer);
    });

    return item;
});

console.log(result);

比较两个对象数组并合并

2 个答案: