如何删除对象中的键并替换为其值？

Question

I have a sample json like

var obj={
    "results":{
        "grade":"A",
        "marks":12
    },
    "data":{
        "name":"sam",
        "gender":"male",
        "age":10
    }
};

Now I want to transform above json to:

var obj={
    "results":{
        "grade":"A",
        "marks":12
    },
    "name":"sam",
    "age":10
}

I was using for each loop

for(var exKey in obj) {
    if(exKey=='data'){
        //replace key data with its value
    }
}

But I was unable to figure out the logic which would do this. So can someone help me here how can I achieve this? Thanks for all ur response, But if iam having some complicated json like:

var obj={
"results":{
    "grade":"A",
     "res":"fail",
    "marks":12
},
"data":{details:{"name":"sam",
                 "gender":"male",
                  "age":10
                }
 },
 "feespaid":"yes",
 "joindate":"sunday"

};

Now if I want to modify or delete some keys inside a key value,some thing like

var obj={
"results":{
    "grade":"A",
    "marks":12
},
"data":{details:{"name":"sam",
                  "age":10
                }
 },
 "joindate":"sunday"
 };

So how we go inside the json and delete

Answer 1

Use inner for-in loop and use bracket-notation to assign variable as key of object

 var obj = { "results": { "grade": "A", "marks": 12 }, "data": { "name": "sam", "gender": "male", "age": 10 } }; for (var exKey in obj) { if (exKey == 'data') { for (var d in obj.data) { if (d != 'gender') obj[d] = obj.data[d]; } delete obj.data; } } console.log(obj); 

Edit: Only to delete few keys from Object , use delete keyword

 var obj = { "results": { "grade": "A", "res": "fail", "marks": 12 }, "data": { details: { "name": "sam", "gender": "male", "age": 10 } }, "feespaid": "yes", "joindate": "sunday" }; delete obj.results.res; delete obj.data.details.gender; delete obj.feespaid; console.log(obj); 

Answer 2

One way to do this without using a loop:

obj.name = obj.data.name;
obj.age = obj.data.age;
delete obj.data;

---

Another way using a for-in loop:

for(item in obj.data) obj[item] = obj.data[item]; // Add items from obj.data to obj
delete obj.gender;                                // Remove gender
delete obj.data;                                  // Remove obj.data

---

Snippet:

 var obj={ "results":{ "grade":"A", "marks":12 }, "data":{ "name":"sam", "gender":"male", "age":10 } }; for(item in obj.data) obj[item] = obj.data[item]; delete obj.gender; delete obj.data; console.log(obj) 

Answer 3

for (var exKey in obj) {
    if(exKey=='data') {
        for (var dataKey in obj[exKey]) {
           obj[dataKey] = obj[exKey][dataKey];
        }
        delete obj[exKey];
    }
}

(I need to investigate the solution below a bit more) EDIT: Deleting nested properties could be done like this:

 
 
 
  
  var invalidProperties = ['gender', 'feespaid']; //add more if needed function recursivelyDeleteProperties(obj) { for (var key in obj) { if(invalidProperties.indexOf(key) !== -1) { delete obj[key]; } else { recursivelyDeleteProperties(obj[key]); } } }