試圖從 JavaScript 中的對象數組中獲取值

Question

我有一個對象數組

let student = [
      {
          rollNo: 1, name: "Rohit", fatherName: "Lalit", motherName: "Abha", age: 22, contact: 7097991361, session: 2017-2021,
          institute: "college", course: "MBBS", stream: "dental"
      },
      {
          rollNo: 2, name: "Rohan", fatherName: "Ram", motherName: "Akanksha", age: 23, contact: 7097775553, session: 2017-2019,
          institute: "college", course: "MA", stream: "history"
      },
      {
          rollNo: 3, name: "Ishfaq", fatherName: "Maqbool", motherName: "Amala", age: 24, contact: 7097891779, session: 2016-2020,
          institute: "college", course: "bTech", stream: "civil"
      },
      {
          rollNo: 4, name: "Sanjay", fatherName: "Ramesh", motherName: "Aditi", age: 24, contact: 7097683032, session: 2017-2018,
          institute: "school", class: 12, stream: "medical"
      },
      {
          rollNo: 5, name: "Anuj", fatherName: "Narayan", motherName: "Amita", age: 23, contact: 7097574082, session: 2018-2019,
          institute: "school", class: 11, stream: "nonMedical"
      }
];

我想通過contact過濾這個array of objects 。 我的輸入是let searchByContact = 7097891779; . 我嘗試過，但控制台上沒有出現任何內容（不是 Output 也不是錯誤）。 這是我的代碼：

function fetchStuByCntct() {
    let StuByCntct = filteredArr.filter(obj => obj["contact"] === searchByContact);
    return StuByCntct;
}
let getStuByCntct = fetchStuByCntct();

if ((searchByRollNo === 0) && (searchByName === "") && (searchByFthrName === "") && (searchByMthrName === "") 
    && (searchByInstitute === "") && (searchByMinAge === 0) && (searchByMaxAge === 0) 
    && (searchByContact === searchByContact) && (searchBySession === 0) && (searchByClass === "") && (searchByCourse === "") 
    && (searchByStream === "") && (searchByAlphabet === "")) {
    console.log(getStuByCntct);
}

對於上述input ，我預期的 output 應該像

Output：

我怎樣才能得到這個？ 幫助，！ 另外，我想在下一個案例中為session設置相同的過濾器。 請讓我知道session的value是否是有效的輸入格式？

Answer 1

您有數據類型問題。

制作一個字符串數據類型為contact和session，例如：

 {
    rollNo: 2, 
    name: "Rohan",
    fatherName: "Ram",
    motherName: "Akanksha",
    age: 23,
    contact: "7097775553",
    session: "2017-2019",
    institute: "college",
    course: "MA",
    stream: "history"
}

然后過濾器將正常工作。

 let student = [ { rollNo: 1, name: "Rohit", fatherName: "Lalit", motherName: "Abha", age: 22, contact: "7097991361", session: "2017-2021", institute: "college", course: "MBBS", stream: "dental" }, { rollNo: 2, name: "Rohan", fatherName: "Ram", motherName: "Akanksha", age: 23, contact: "7097775553", session: "2017-2019", institute: "college", course: "MA", stream: "history" }, { rollNo: 3, name: "Ishfaq", fatherName: "Maqbool", motherName: "Amala", age: 24, contact: "7097891779", session: "2016-2020", institute: "college", course: "bTech", stream: "civil" }, { rollNo: 4, name: "Sanjay", fatherName: "Ramesh", motherName: "Aditi", age: 24, contact: "7097683032", session: "2017-2018", institute: "school", class: 12, stream: "medical" }, { rollNo: 5, name: "Anuj", fatherName: "Narayan", motherName: "Amita", age: 23, contact: "7097574082", session: "2018-2019", institute: "school", class: 11, stream: "nonMedical" } ]; const search = (name, value) => { return student.filter( obj => obj[name] === value); } console.log( "contact 7097891779:", search("contact", "7097891779") ); console.log( "session 2017-2018:", search("session", "2017-2018") );