javascript object to map

Question

I have a list of objects

{
  "list": {
    "item": [
      {
        "id": "12",
        "value": "abc"
      },
      {
        "id": "34",
        "value": "pqr"
      }
    ]
  }
}

and want to convert it to a map

{"12": "abc", "34","pqr"}

What is the easiest way?

I have tried iterating on each object, even Array.map(function), wanna know if there is any easier way

Is it should be `{"12","abc", "34","pqr"}` or `{"12":"abc", "34":"pqr"}` ? Could you correct that ? — Berkay Turancı, Jan 15 '13 at 12:36
tried iterating on each object, even Array.map(function). wanna know if there is any easier way — sidgate, Jan 15 '13 at 12:40
I noticed you did un-accept my answer, was something wrong? I would like to know what, so I could improve it further, thanks — intuitivepixel, Jul 11 '13 at 09:50
sorry, I was trying few actions around the questions and answer. — sidgate, Jul 11 '13 at 09:54

score 2 · Accepted Answer · answered Jan 15 '13 at 12:39

2

myObject.list.item.forEach(function(item){
  myMap[item.id] = item.value;
}

Something like this would do it...

answered Jan 15 '13 at 12:39

intuitivepixel

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score 1 · Answer 2 · answered Jan 15 '13 at 12:38

1

for loop is the easiest way:

var result = {};
for (var i = 0; i < obj.list.item.length; i++) {
    result[obj.list.item[i].id] = obj.list.item[i].value;
}
console.log(result);

answered Jan 15 '13 at 12:38

VisioN

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score 1 · Answer 3 · answered Jan 21 '13 at 20:30

I would do something like this:

function map(list, key, value){
    var result = {};
    for(i in list){
        result[list[i][key]] = list[i][value];
    }
    return result;
}

Then with your object:

var list =  {
  "list": {
    "item": [
      {
        "id": "12",
        "value": "abc"
      },
      {
        "id": "34",
        "value": "pqr"
      }
    ]
  }
}

I could call the function like this:

map(list["list"]["item"],"id","value")

And it will return: { 12: "abc", 34: "pqr" }

score 0 · Answer 4 · answered Jan 15 '13 at 12:38

0

To transform in array or a list with jsondecode in php or in c# with class with deserializate(http://stackoverflow.com/questions/2546138/deserializing-json-data-to-c-sharp-using-json-net)

answered Jan 15 '13 at 12:38

Andrei Chitu

39
1
3

1

The question is tagged JavaScript. So neither PHP or C# are valid solutions. – Sirko Jan 15 '13 at 12:39

javascript object to map

4 Answers4