在数组中查找元素并将其添加到另一个javascript

Question

下面是我正在使用的 JSON 文件的片段，在数组“target_indices”中，您将看到我想要提取的数据的索引。 如果 field_index 中有我的目标索引，我似乎陷入了匹配中，我想将它添加到 const 学校。 任何帮助在这里将不胜感激！

"fields": [{"type":"int","id":"_id"},{"type":"text","id":"Centre Code"},{"type":"text","id":"Centre Name"},{"info":{"notes":"","type_override":"","label":""},"type":"text","id":"Centre Type"},{"type":"text","id":"Centre Status"},{"type":"text","id":"Host Centre Code"},{"type":"text","id":"Host Centre Name"},{"type":"text","id":"Official Low Year Level"},{"type":"text","id":"Official High Year Level"},{"type":"text","id":"Officer In Charge Title"},{"type":"numeric","id":"School Band"},{"type":"timestamp","id":"Show Holiday Date"},{"type":"text","id":"Internet Site"},{"type":"text","id":"Phone Number"},{"type":"text","id":"Restrict Contact Outside Teaching Hours"},{"type":"text","id":"Fax Number"},{"type":"text","id":"Actual Address Line 1"},{"type":"text","id":"Actual Address Line 2"},{"type":"text","id":"Actual Address Line 3"},{"type":"numeric","id":"Actual Address Post Code"},{"type":"text","id":"Postal Address Line 1"},{"type":"text","id":"Postal Address Line 2"},{"type":"text","id":"Postal Address Line 3"},{"type":"numeric","id":"Postal Address Post Code"},{"type":"text","id":"Education Geographic Region"},{"type":"text","id":"Federal Electorate"},{"type":"text","id":"State Electorate"},{"type":"text","id":"Local Government Area"},{"type":"text","id":"Statistical Area Level2"},{"type":"numeric","id":"Statistical Area Level2 Code"},{"type":"text","id":"Remoteness Area"},{"type":"text","id":"Enrolment Effective Date"},{"type":"numeric","id":"All Student Count"},{"type":"text","id":"Campus All Student Count"},{"type":"numeric","id":"ABN"},{"info":{"notes":"","type_override":"","label":""},"type":"text","id":"Sector"},{"type":"text","id":"Non-State Sector"},{"type":"numeric","id":"Longitude"},{"type":"numeric","id":"Latitude"}],
  "records": 

[2,"0591","Abercorn State School","State School","Open","","","Prep Year","Year 6","Principal",5,"2020-08-10T00:00:00","www.abercornss.eq.edu.au","(07) 4167 5190","Y","(07) 4167 5135","","957 Wuruma Dam Road","Abercorn",4627,"957 Wuruma Dam Road","Abercorn","",4627,"Central Queensland","Flynn","Callide","North Burnett (R)","Monto - Eidsvold",319021508,"Outer Regional Australia","2019 July",18,"",22101246877,"State","",151.127031,-25.135955],

[3,"1275","Abergowrie State School","State School","Open","","","Prep Year","Year 6","Principal",5,"2020-07-03T00:00:00","www.abergowriess.eq.edu.au","(07) 4777 4672","N","(07) 4777 4686","","5 Venables Road","Abergowrie",4850,"5 Venables Road","Abergowrie","",4850,"North Queensland","Kennedy","Hinchinbrook","Hinchinbrook (S)","Ingham Region",318011465,"Remote Australia","2019 July",4,"",87244066343,"State","",145.88351,-18.474697],

fetch('./qldopendata-json/school_locations.json')
.then(response => {
   return response.json();
})
.then(schoolData => {

   const schools = [];
   const target_indices = [2,7,8,12,13,17,18,19,37,38];
   schoolData.records.forEach((school_value) => {
      const tidied_school = {};
      schoolData.fields.forEach((field_name, field_index) => {
         tidied_school[field_index] = school_value[field_index]

         if (field_index in target_indices){              //this is where i need help
            schools.push(tidied_school);
         }

      })

      console.log(schools);
   })
   
})  

Answer 1

您可以使用reduce()。

下面的例子：

 const schoolData = { fields: [ { type: "int", id: "_id" }, { type: "text", id: "Centre Code" }, { type: "text", id: "Centre Name" }, { info: { notes: "", type_override: "", label: "" }, type: "text", id: "Centre Type", }, { type: "text", id: "Centre Status" }, { type: "text", id: "Host Centre Code" }, { type: "text", id: "Host Centre Name" }, { type: "text", id: "Official Low Year Level" }, { type: "text", id: "Official High Year Level" }, { type: "text", id: "Officer In Charge Title" }, { type: "numeric", id: "School Band" }, { type: "timestamp", id: "Show Holiday Date" }, { type: "text", id: "Internet Site" }, { type: "text", id: "Phone Number" }, { type: "text", id: "Restrict Contact Outside Teaching Hours" }, { type: "text", id: "Fax Number" }, { type: "text", id: "Actual Address Line 1" }, { type: "text", id: "Actual Address Line 2" }, { type: "text", id: "Actual Address Line 3" }, { type: "numeric", id: "Actual Address Post Code" }, { type: "text", id: "Postal Address Line 1" }, { type: "text", id: "Postal Address Line 2" }, { type: "text", id: "Postal Address Line 3" }, { type: "numeric", id: "Postal Address Post Code" }, { type: "text", id: "Education Geographic Region" }, { type: "text", id: "Federal Electorate" }, { type: "text", id: "State Electorate" }, { type: "text", id: "Local Government Area" }, { type: "text", id: "Statistical Area Level2" }, { type: "numeric", id: "Statistical Area Level2 Code" }, { type: "text", id: "Remoteness Area" }, { type: "text", id: "Enrolment Effective Date" }, { type: "numeric", id: "All Student Count" }, { type: "text", id: "Campus All Student Count" }, { type: "numeric", id: "ABN" }, { info: { notes: "", type_override: "", label: "" }, type: "text", id: "Sector", }, { type: "text", id: "Non-State Sector" }, { type: "numeric", id: "Longitude" }, { type: "numeric", id: "Latitude" }, ], records: [ [ 2, "0591", "Abercorn State School", "State School", "Open", "", "", "Prep Year", "Year 6", "Principal", 5, "2020-08-10T00:00:00", "www.abercornss.eq.edu.au", "(07) 4167 5190", "Y", "(07) 4167 5135", "", "957 Wuruma Dam Road", "Abercorn", 4627, "957 Wuruma Dam Road", "Abercorn", "", 4627, "Central Queensland", "Flynn", "Callide", "North Burnett (R)", "Monto - Eidsvold", 319021508, "Outer Regional Australia", "2019 July", 18, "", 22101246877, "State", "", 151.127031, -25.135955, ], [ 3, "1275", "Abergowrie State School", "State School", "Open", "", "", "Prep Year", "Year 6", "Principal", 5, "2020-07-03T00:00:00", "www.abergowriess.eq.edu.au", "(07) 4777 4672", "N", "(07) 4777 4686", "", "5 Venables Road", "Abergowrie", 4850, "5 Venables Road", "Abergowrie", "", 4850, "North Queensland", "Kennedy", "Hinchinbrook", "Hinchinbrook (S)", "Ingham Region", 318011465, "Remote Australia", "2019 July", 4, "", 87244066343, "State", "", 145.88351, -18.474697, ], ], }; const targetIndices = [2, 7, 8, 12, 13, 17, 18, 19, 37, 38]; const schools = schoolData.records.reduce((a, b) => { const requiredObject = targetIndices.reduce((acc, t) => { acc.push(b[t]); return acc; }, []); a.push(requiredObject); return a; }, []); console.log(schools);

Answer 2

希望这可以帮助你。 您将需要使用此手动创建 target_indices_names，可能还有另一种动态方法，但因为它只有 10 个属性。

var schoolData = '[[2,"0591","Abercorn State School","State School","Open","","","Prep Year","Year 6","Principal",5,"2020-08-10T00:00:00","www.abercornss.eq.edu.au","(07) 4167 5190","Y","(07) 4167 5135","","957 Wuruma Dam Road","Abercorn",4627,"957 Wuruma Dam Road","Abercorn","",4627,"Central Queensland","Flynn","Callide","North Burnett (R)","Monto - Eidsvold",319021508,"Outer Regional Australia","2019 July",18,"",22101246877,"State","",151.127031,-25.135955],'+
'[3,"1275","Abergowrie State School","State School","Open","","","Prep Year","Year 6","Principal",5,"2020-07-03T00:00:00","www.abergowriess.eq.edu.au","(07) 4777 4672","N","(07) 4777 4686","","5 Venables Road","Abergowrie",4850,"5 Venables Road","Abergowrie","",4850,"North Queensland","Kennedy","Hinchinbrook","Hinchinbrook (S)","Ingham Region",318011465,"Remote Australia","2019 July",4,"",87244066343,"State","",145.88351,-18.474697]]'

var parsedSchoolData = JSON.parse(schoolData);

const schools = [];
const target_indices_names = ['one','two','three','four','five','six','seven','eight', 'nine', 'ten'];
const target_indices = [2,7,8,12,13,17,18,19,37,38];

parsedSchoolData.forEach(element => {

    // New Object
    var obj = new Object();

    // Pass through all Target Indices
    target_indices.forEach(neededIndex => {
        console.log(neededIndex);
        var propertyName = target_indices_names[target_indices.indexOf(neededIndex)];
        // Set Property to Value
        obj[propertyName] = element[neededIndex];
    });

    // Push/Add the created Object to the list
    schools.push(obj);
});

console.log(schools[0]);