从通过 fs 导入的数组中获取所有项目

Question

**Explanation**

I need to be able to get the values from 
`jsonParsed.students[actStudent].evnetsPartaken`
Which is an array and would be for example` [1,2,0]`  
(example, not full data, check attachments for full data)
```json
{
    "students":
    [

    { 
        
        "firstName":"John", 
             "lastName":"Doe", 
             "gradeNum":"9",
             "serviceHours":99.00,
             "studentNotes":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla sem magna, commodo nec enim quis.",
             "evnetsPartaken":[1,3.1] 
            },
    { 
        
        "firstName":"SamSame", 
             "lastName":"SamSame", 
             "serviceHours":234,
              "studentNotes":":trollface.jpg:",
             "evnetsPartaken":[1,3] 
            },
    { 

每个值与configEventsjson数组中事件事件的数组编号相关

同样，这不是完整的数据集

[
"configEvents":
  [

  { 
      
     
           "eventName":"Football", 
           "isSport": true,
           "eventTags":["exampleTag1","exampleTag2"],
           "evnetDates":[13934823420,12892839483,23642834823 ]
          },
  { 
      
       
           "eventName":"Softball", 
           "isSport": true,
           "eventTags":["exampleTag1","exampleTag2"],
           "evnetDates":[13934823420,12892839483,23642834823 ]
          },
          { 
      
           "eventName":"Spirt Rally", 
           "isSport": false,
           "eventTags":["inSchool","exampleTag2"],
           "evnetDates":[878687686868 ]
          },
  { 
      
           "eventName":"Grade Party", 
           "isSport": false,
           "eventTags":["inSchool","exampleTag2"],
           "evnetDates":[82832497686868 ]
          } 
]

**Issue** 
I can't figure how how to get the array values  `jsonParsed.students[actStudent].evnetsPartaken[]`
```js
fs.readFile('./testdata.json', 'utf8', (error, data) => {
     if(error){
        console.log(error);
        return;
     }

     //Store the json data output
     var jsonData = data;
     //Store a JSON Parsed version of the data (object.based )
     var jsonParsed = JSON.parse(jsonData)
    //One liner made by Dinesh Soni to make it easier to extracted values from json objects, example and article can be found in readme



     console.log(jsonParsed);
     console.log(jsonParsed.students);
     var actStudent = 1;
     var actEvents = 
     console.log(jsonParsed.students[actStudent].firstName + " " + jsonParsed.students[actStudent].lastName + " Partakes in " + (
      jsonParsed.configEvents[
      jsonParsed.students[1].evnetsPartaken[] //issue is here (this is the said arguments)
    ].eventName
      ));

})

如果我自己提出论点，效果很好，但这不是解决方案 有没有正确的方法获取这些值，需要注意的是actStudent只是为了测试，在实际程序中会有很大的变化

我需要把它放进去

jsonParsed.configEvents[jsonParsed.students[1].evnetsPartaken[]].eventName 

让它正常工作 因为 .students[1].evnetsPartaken[] 告诉它要使用什么事件数组，然后括号外的所有内容都使用该数据来获取正确的事件信息 例如 jsonParsed.configEvents[jsonParsed.students[1].evnetsPartaken[0]].eventName

would return Softball because it would corelate to configEvents[1].eventName which is Softball

1. 在我的例子中

   "evnetsPartaken":[1,3] 
   

   输入 [0] 将获得第一个参数，因为您从零开始计算 jsons

2. 这样做之后你会得到 Event array [1] 这是 Softball

   testdata.json on pastecord
   main.js on pastecord

   索引文件不是解决方案，只是临时修复。我尝试做一个 for 循环，但在做时出现语法错误。 ps 我是电子新手，所以我可能正在做一些非常愚蠢的事情。这是我的第一个项目，它...由于骨髓所以我没有太多时间。

Answer 1

谢谢 iialexidai

map 把它们作为一个数组给我，我只选择了 eventName，就像你的代码应该的那样

console.log(jsonParsed.students[actStudent].firstName + " " + jsonParsed.students[actStudent].lastName + " Partakes in " + (
    jsonParsed.students[actStudent].evnetsPartaken.map(evnet => jsonParsed.configEvents[evnet].eventName).join(`, `)
));