split out object property and values from an array

Question

From this json arrays

{
    "result": [
        {
            "id": "1",
            "name": "John",
            "type": "B",
            "score":"passed"
        },
        {
            "id": "2",
            "name": "Alice",
            "type": "A",
            "score":"failed"
        }

    ]
}

How to split out some field and turn it intosomething like this

{
    "result": [
        {
            "id": "1",
            "type": "B",
        },
        {
            "id": "2",
            "type": "A",
        }

    ]
}

I do not want to use splice in my case, above is just sample code.

@Pointy updated my question, i do not want to delete, above code is just sample code. — James Lemon, Apr 11 '15 at 14:12
What do you mean, "just sample code"? If you can't pose a clear question how do you expect to get help? The only difference between the (inexplicably edited) lists above is that the objects in the second one are missing two attributes present in the first one. — Pointy, Apr 11 '15 at 14:13
@Pointy just don't use delete because I need only few field, delete is bad in my case. — James Lemon, Apr 11 '15 at 14:13

score 4 · Accepted Answer · answered Apr 11 '15 at 14:15

4

Try this:

var input = {
    "result": [
        {
            "id": "1",
            "name": "John",
            "type": "B",
            "score":"passed"
        },
        {
            "id": "2",
            "name": "Alice",
            "type": "A",
            "score":"failed"
        }

    ]
};
var output = {
    result: input.result.map(function(item) {
       return {
          id: item.id,
          type: item.type
       };
    })
}

answered Apr 11 '15 at 14:15

jcubic

61,973
54
229
402

you don't need `""` for result? – James Lemon Apr 11 '15 at 14:18
@JamesLemon no, you don't need quotes for keys. – jcubic Apr 11 '15 at 14:25
what if I just want array? discard the result key? – James Lemon Apr 11 '15 at 14:31
@JamesLemon then just use `var output = input.result.map(function(item) { ... });` – jcubic Apr 11 '15 at 14:34
u will get an error, unexpected token . – James Lemon Apr 11 '15 at 14:40
@JamesLemon where I'll get an error? – jcubic Apr 11 '15 at 14:43
if u don't use a key, line input.result.map(function(item) { – James Lemon Apr 11 '15 at 14:49
1

@JamesLemon if you don't use key then you can't use object it will work, check my comment. – jcubic Apr 11 '15 at 14:51
my bad, my mistake, ur code should work – James Lemon Apr 11 '15 at 15:09

score 3 · Answer 2 · answered Apr 11 '15 at 14:15

Try like this

   var json = {
   "result": [{
           "id": "1",
           "name": "John",
           "type": "B",
           "score": "passed"
       }, {
           "id": "2",
           "name": "Alice",
           "type": "A",
           "score": "failed"
       }

   ]
   };

   json.result.forEach(function(item) {
   delete item.name;
   delete item.score;
   });

   console.log(json);

score 3 · Answer 3 · answered Apr 11 '15 at 14:15

3

iterate over arry and remove age property

var json = [
    {"name":"john",
     "age":"30",
     "gender":"male"},
    {"name":"Alice",
     "age":"20",
     "gender":"female"}

];
json.forEach(function(x){
delete x['age'];
})

answered Apr 11 '15 at 14:15

Omar Elawady

3,300
1
13
17

simple yet working solution, just nice. – James Lemon Apr 11 '15 at 15:09

split out object property and values from an array

3 Answers3