如何比较来自两个array.map的数据答案

【问题标题】：How to compare data from two array.map如何比较来自两个array.map的数据
【发布时间】：2021-12-28 14:58:30
【问题描述】：

所以我有两组数据：

第一个数据是考试的答案。

第二个数据是参加考试的学生的答案。

根据这两个数据，我尝试对它们进行array.map。

const answerKey = [{
    id: "bida01",
    answerKey: "b",
    category: "bida",
    nomorSoal: "01",
    score: 20
  },
  {
    id: "bida02",
    answerKey: "b",
    category: "bida",
    nomorSoal: "02",
    score: 30
  }
]



const participants1 = [{
    answers: {
      bida01: "a",
      bida02: "b",
      bida03: "c",
    },
    category: "bida",
    firstName: "John",
    lastName: "Collins",
    school: "Something Junior High",
    address: "Somewhere",
    email: "blabla@bla.com"
  },
  {
    answers: {
      bida01: "b",
      bida02: "b",
      bida03: "a",
    },
    category: "bida",
    firstName: "Jennifer",
    lastName: "Harley",
    school: "Somewhere Junior High",
    address: "Also somewhere",
    email: "notsure@bla.com"
  }
]




const answerKeyData = answerKey.map((elem) => {
  console.log(elem.id, elem.answerKey, elem.score);
})

const participantData = participants1.map((elem, idx) => {
  console.log(elem.answer, elem.firstName, elem.middleName, elem.lastName, elem.school);

});

现在我可以从这些 console.logs 的结果中看到我可以得到我想要比较的值。我在这里的目的是将学生的答案与答案键进行比较，然后如果它们匹配：

return score += elem.score

但是我如何访问 elem.id、elem.answerKey、elem.score？我应该用它们制作一个新对象（比如说objectAnswerKey）吗？我该怎么做？

与 elem.firstName、elem.middleName、elem.lastName、elem.school 和 elem.answer 相同。我应该创建一个新对象（比如说 objectAnswer）然后比较 objectAnswer 和 objectAnswerKey？

或者有更简单的方法吗？

【问题讨论】：

我给你做了一个 sn-p 。请将其设为minimal reproducible example
你可以做一个嵌套循环。首先，遍历参与者，然后遍历他们的答案，然后遍历问题，并检查参与者的答案是否等于您从问题数组中获得的正确答案。如果是，则将分数添加给用户。

标签： javascript arrays object compare

【解决方案1】：

您可以使用嵌套的 map/forEach/reduce 数组方法通过比较问题 id 和 answerKey 来计算分数，如下所示，

const participantsWithScore = participants1.map(student => {
    const answers = student.answers;
    const questions = Object.keys(answers);
    let score = 0;
    questions.forEach(question => {
        const answer = answers[question];
        const correctAnswer = answerKey.find(key => key.id === question);
        if(correctAnswer && correctAnswer.answerKey === answer) {
            score += correctAnswer.score;
        }
    });
    student.score = score;
    return student;
});
console.log(participantsWithScore);

在控制台中，您可以看到所有具有计算得分属性的参与者。

【讨论】：

【解决方案2】：

const answerKey = [
  {
    id: "bida01",
    answerKey: "b",
    category: "bida",
    nomorSoal: "01",
    score: 20
  },
  {
    id: "bida02",
    answerKey: "b",
    category: "bida",
    nomorSoal: "02",
    score: 30
  }
];

const participants1 = [
  {
    answers: {
      bida01: "a",
      bida02: "b",
      bida03: "c"
    },
    category: "bida",
    firstName: "John",
    lastName: "Collins",
    school: "Something Junior High",
    address: "Somewhere",
    email: "blabla@bla.com"
  },
  {
    answers: {
      bida01: "b",
      bida02: "b",
      bida03: "a"
    },
    category: "bida",
    firstName: "Jennifer",
    lastName: "Harley",
    school: "Somewhere Junior High",
    address: "Also somewhere",
    email: "notsure@bla.com"
  }
];

const handleCalculate = () => {
    const studensScore = [];
    participants1.forEach((student) => {
      let score = 0;
      answerKey.forEach((answerKeyItem) => {
        const userAnswer = student.answers[answerKeyItem.id];
        if (userAnswer === answerKeyItem.answerKey) {
          score += answerKeyItem.score;
        }
      });
      const studentData = {
        fullname: student.firstName + " " + student.lastName,
        score: score
      };
      studensScore.push(studentData);
    });
    return studensScore;
  };
  
  console.log(handleCalculate())

【讨论】：