javascript - Foreach JSON with random keys

Question

I currently experience the problem when i want to deserialize json. I dont know how to do this with unknown keys

[
    {
        "84.200.222.4": [
            0.022
        ]
    },
    {
        "84.200.230.82": [
            1.315
        ]
    },
    {
        "80.156.160.161": [
            0.874
        ]
    },
    {
        "72.14.217.108": [
            0.662
        ]
    },
    {
        "108.170.251.193": [
            0.638
        ]
    },
    {
        "216.239.54.61": [
            0.64
        ]
    },
    {
        "172.217.23.131": [
            0.564
        ]
    }
]

How would i go about this when i want

1. 84.200.222.4
- 0.022

2. 84.200.230.82
- 1,315

3. 80.156.160.161
- 0.874

4 72.14.217.108
- 0.662

Etc.. I'm currently not sure on how to loop through unknown keys is that possible?

You can use `Object.keys(obj).forEach((k, i) => console.log(\`${i}. ${key} \n ${obj[key]}\`)` — T4rk1n, Jul 14 '17 at 19:53

score 5 · Answer 1 · answered Jul 14 '17 at 19:53

5

Simply iterate through the array, and use Object.keys(), which returns an array of all the object's properties.

arr.forEach(obj => {
    console.log(Object.keys(obj)[0]);
})

answered Jul 14 '17 at 19:53

frozen

2,114
14
33

This works perfect! – Select Jul 14 '17 at 20:01

InfinityCounter · Answer 2 · 2017-07-14T20:03:01.830

2

I didn't test this but It should work.

Firstly it's an array so you want to loop over that. Then although the object keys vary, you can use object.keys to get the keys of an object, or just iterate over the object. So your code would look like so

function printValues(arr)
{
    var arrayLength = arr.length;
    for (var i = 0; i < arrayLength; i++) 
    {
        let obj = arr[i];
        for (var key in obj) {
            x = obj[key];
            alert(x);
        }
    }
}

This could be optimized down to a single line but I made it as simple as possible for you to understand.

edited Jul 14 '17 at 20:03

answered Jul 14 '17 at 19:56

InfinityCounter

374
2
4
14

use `forEach` to loop over arrays – frozen Jul 14 '17 at 19:57
@randnum-1 that's not a requirement. For loops are just as valid. – Patrick Roberts Jul 14 '17 at 20:02
@randnum-1 I admit forEach are the best thing to use but based on OP's question I don't think he has a firm grasp on the basics yet so I didn't want to shrink the code. – InfinityCounter Jul 14 '17 at 20:04
1

Actually can do things with a `for()` you can't with `forEach` like `break`...not that it's applicable in OP case but nothing wrong with using `for()` – charlietfl Jul 14 '17 at 20:07

score 2 · Answer 3 · answered Jul 14 '17 at 19:59

Here's a quick way to process it:

var array = [{
  "84.200.222.4": [0.022]
}, {
  "84.200.230.82": [1.315]
}, {
  "80.156.160.161": [0.874]
}, {
  "72.14.217.108": [0.662]
}, {
  "108.170.251.193": [0.638]
}, {
  "216.239.54.61": [0.64]
}, {
  "172.217.23.131": [0.564]
}];

array.forEach((object, index) => {
  var ip = Object.keys(object).pop();
  console.log(`${index + 1}. ${ip}\n- ${object[ip]}`);
});

score 1 · Answer 4 · answered Jul 14 '17 at 19:57

1

Use:

var parsed = JSON.parse(data);

this will return a javascript object/array.

then do

var result = parsed[0].keys.map(key => { /** do whatever **/});

answered Jul 14 '17 at 19:57

ThomasK

300
1
8

javascript - Foreach JSON with random keys

4 Answers4