javascript - 映射对象内的数组

Question

我有以下复杂的 JSON 对象，其中包含数组和数组内的数组。如何解析这些数组并为数组中的每个元素创建一个对象数组。我在我的项目中使用 lodash 库，以防万一有可用的功能。

   {
  studentId: 123
  name: XYZ
  phone: 34234234
  gender: M
  subjects: [{
     studentId: 123
     subjectName: Math
     scores:50
    assignments:[
     {
        type: Internal,
        submitted: yes,
        status: failed 
     },
     {
        type: External,
        submitted: yes,
        status: passed 
     }] 
},
{
     studentId: 123
     subjectName: Science
     score: 20
     assignments:[
     {
        type: Internal,
        submitted: yes,
        status: passed 
     },
     {
        type: External,
        submitted: yes,
        status: failed 
     }]
}] 

}

预期:

[{
  studentId:123,
  name: XYZ
  phone: 34234234
  gender: M,  
  subjectName: Math
  scores:50
  assignments:[
     {
        type: Internal,
        submitted: yes,
        status: failed 
     },
     {
        type: External,
        submitted: yes,
        status: passed 
     }]
},
{
 studentId:123,
  name: XYZ
  phone: 34234234
  gender: M,  
  subjectName: science
  scores:20
  assignments:[
     {
        type: Internal,
        submitted: yes,
        status: failed 
     },
     {
        type: External,
        submitted: yes,
        status: passed 
     }]
}
]

Answer 1

您可以使用omit要在没有 subjects 数组的情况下获取学生的详细信息，请使用这些details 来使用 defaults 转换主题数组中的每一项。通过map .

var details = _.omit(data, 'subjects');
var result = _.map(data.subjects, function(subject) {
  return _.defaults({}, details, subject);
});

var data = {
    studentId: '123',
    name: 'XYZ',
    phone: '34234234',
    gender: 'M',
    subjects: [{
        studentId: '123',
        subjectName: 'Math',
        scores: 50,
        assignments: [{
            type: 'Internal',
            submitted: 'yes',
            status: 'failed'
          },
          {
            type: 'External',
            submitted: 'yes',
            status: 'passed'
          }
        ]
      },
      {
        studentId: '123',
        subjectName: 'Science',
        score: 20,
        assignments: [{
            type: 'Internal',
            submitted: 'yes',
            status: 'passed'
          },
          {
            type: 'External',
            submitted: 'yes',
            status: 'failed'
          }
        ]
      }
    ]
};

var details = _.omit(data, 'subjects');
var result = _.map(data.subjects, function(subject) {
  return _.defaults({}, details, subject);
});

console.log(result);

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