如何比較來自兩個array.map的資料

所以我有兩組資料：

第一個資料是考試的答案鍵。

第二個資料是參加考試的學生的答案。

從這兩個資料中，我嘗試對它們進行 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: "[email protected]"
  },
  {
    answers: {
      bida01: "b",
      bida02: "b",
      bida03: "a",
    },
    category: "bida",
    firstName: "Jennifer",
    lastName: "Harley",
    school: "Somewhere Junior High",
    address: "Also somewhere",
    email: "[email protected]"
  }
]




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);

});

現在我可以從那些 console.logs 的結果中看到我可以獲得我想要比較的值。我的目的是將學生的答案與答案鍵進行比較，然后如果它們匹配：

return score  = elem.score

但是我如何訪問 elem.id、elem.answerKey、elem.score？我應該用它們創建一個新物件（比如 objectAnswerKey）嗎？我怎樣才能做到這一點？

elem.firstName、elem.middleName、elem.lastName、elem.school 和elem.answer 也是如此。我應該創建一個新物件（比如 objectAnswer）然后比較 objectAnswer 和 objectAnswerKey 嗎？

或者有更簡單的方法嗎？

uj5u.com熱心網友回復：

您可以使用嵌套的 map/forEach/reduce 陣列方法通過比較問題 id 和 answerKey 來計算分數，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);

在控制臺中，您可以看到所有具有計算分數屬性的參與者。

uj5u.com熱心網友回復：

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: "[email protected]"
  },
  {
    answers: {
      bida01: "b",
      bida02: "b",
      bida03: "a"
    },
    category: "bida",
    firstName: "Jennifer",
    lastName: "Harley",
    school: "Somewhere Junior High",
    address: "Also somewhere",
    email: "[email protected]"
  }
];

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())

標籤：javascript 数组 目的 相比

上一篇：JQ根據鍵值獲取唯一的物件和陣列

下一篇：JS：將物件從一個陣列添加到另一個陣列中的物件