Retrieving a property of a JSON object by index?

Question

Assuming this JSON object:

var obj = {
    \"set1\": [1, 2, 3],
    \"set2\": [4, 5, 6, 7, 8],
    \"set3\": [9, 10, 11, 12]
};

The \"set

Answer 1

No, there is no way to access the element by index in JavaScript objects.

One solution to this if you have access to the source of this JSON, would be to change each element to a JSON object and stick the key inside of that object like this:

var obj = [
    {"key":"set1", "data":[1, 2, 3]},
    {"key":"set2", "data":[4, 5, 6, 7, 8]},
    {"key":"set3", "data":[9, 10, 11, 12]}
];

You would then be able to access the elements numerically:

for(var i = 0; i < obj.length; i++) {
    var k = obj[i]['key'];
    var data = obj[i]['data'];
    //do something with k or data...
}