Javascript 从id上的两个对象数组角度类型脚本映射新对象

我有类似的东西

export class Question {
  id: string;
  title: string;
  description: string;
  answers: Answer[];
}

export class Answer {
  id: string;
  text: string;
  questionId: string;
}

answers =  [
    {
      "id": 1,
      "text": "some comment1",
      "questionId": 1
    },
    {
      "id": 2,
      "text": "some comment2",
      "questionId": 3
    },
    {
      "id": 3,
      "text": "some comment3",
      "questionId": 3
    }
  ];

questions = [
    {
      "id": 1,
      "title": "Name1",
      "description": "typicode1"
    },
    {
      "id": 2,
      "title": "Name2",
      "description": "typicode2"
    },
    {
      "id": 3,
      "title": "Name3",
      "description": "typicode3"
    }
  ];

questionsAndAnswers: Question[];

questionsAndAnswers = [{
      id: 1,
      title: Name1,
      description: typicode1;
      answers: [{
          "id": 1,
          "text": "some comment1",
          "questionId": 1
        }]
},
{
      id: 2,
      title: Name2,
      description: typicode2;
      answers: []
},
{
      id: 3,
      title: Name3,
      description: typicode3;
      answers: [{
          "id": 2,
          "text": "some comment2",
          "questionId": 3
        },
{
          "id": 3,
          "text": "some comment3",
          "questionId": 3
        }]
}
];

我有两个像这样的物体

export class Question {
  id: string;
  title: string;
  description: string;
  answers: Answer[];
}

export class Answer {
  id: string;
  text: string;
  questionId: string;
}

answers =  [
    {
      "id": 1,
      "text": "some comment1",
      "questionId": 1
    },
    {
      "id": 2,
      "text": "some comment2",
      "questionId": 3
    },
    {
      "id": 3,
      "text": "some comment3",
      "questionId": 3
    }
  ];

questions = [
    {
      "id": 1,
      "title": "Name1",
      "description": "typicode1"
    },
    {
      "id": 2,
      "title": "Name2",
      "description": "typicode2"
    },
    {
      "id": 3,
      "title": "Name3",
      "description": "typicode3"
    }
  ];

questionsAndAnswers: Question[];

questionsAndAnswers = [{
      id: 1,
      title: Name1,
      description: typicode1;
      answers: [{
          "id": 1,
          "text": "some comment1",
          "questionId": 1
        }]
},
{
      id: 2,
      title: Name2,
      description: typicode2;
      answers: []
},
{
      id: 3,
      title: Name3,
      description: typicode3;
      answers: [{
          "id": 2,
          "text": "some comment2",
          "questionId": 3
        },
{
          "id": 3,
          "text": "some comment3",
          "questionId": 3
        }]
}
];

现在我需要将答案映射到有关属性的正确问题答案

我的新问题和答案应该是这样的

export class Question {
  id: string;
  title: string;
  description: string;
  answers: Answer[];
}

export class Answer {
  id: string;
  text: string;
  questionId: string;
}

answers =  [
    {
      "id": 1,
      "text": "some comment1",
      "questionId": 1
    },
    {
      "id": 2,
      "text": "some comment2",
      "questionId": 3
    },
    {
      "id": 3,
      "text": "some comment3",
      "questionId": 3
    }
  ];

questions = [
    {
      "id": 1,
      "title": "Name1",
      "description": "typicode1"
    },
    {
      "id": 2,
      "title": "Name2",
      "description": "typicode2"
    },
    {
      "id": 3,
      "title": "Name3",
      "description": "typicode3"
    }
  ];

questionsAndAnswers: Question[];

questionsAndAnswers = [{
      id: 1,
      title: Name1,
      description: typicode1;
      answers: [{
          "id": 1,
          "text": "some comment1",
          "questionId": 1
        }]
},
{
      id: 2,
      title: Name2,
      description: typicode2;
      answers: []
},
{
      id: 3,
      title: Name3,
      description: typicode3;
      answers: [{
          "id": 2,
          "text": "some comment2",
          "questionId": 3
        },
{
          "id": 3,
          "text": "some comment3",
          "questionId": 3
        }]
}
];

您可以尝试将数组与函数一起使用。试试下面的方法

var-questions=[{“id”：1，“title”：“Name1”，“description”：“typicode1”}，{“id”：2，“title”：“Name2”，“description”：“typicode2”}，{“id”：3，“title”：“Name3”，“description”：“typicode3”}]；
var answers=[{“id”：1，“文本”：“一些评论1”，“问题id”：1}，{“id”：2，“文本”：“一些评论2”，“问题id”：3}，{“id”：3，“文本”：“一些评论3”，“问题id”：3}]；
var questions and Answers=问题。减少（（会计科目、当前、索引）=>{
acc[指数]=当前汇率；
acc[index].answers=answers.filter（answer=>answer.questionId==curr.id）；
返回acc；
}, []);
控制台日志（问题和答案）你试过什么？你有没有考虑过在你的答案数组中使用
.filter
来获得某个特定问题的答案？我甚至不知道如何开始，我是否必须先回答每个问题，然后再回答内部答案？这很好，我从未使用过reduce，谢谢，你能在地图和foreach上做出答案吗，我能理解，因为我需要学习，这对我来说太复杂了：（我认为最好了解一下
reduce
函数。它几乎在所有主要语言中都可用。通过在内部打印变量
acc
，
curr
，并查看它如何在数组中迭代，可能更容易开始。