How to get the index of an object in JSON by its id?

Question

JavaScript

The situation is this, I have a json file with the following structure:

[
    {
        ....
        "id": 1,
       ...
    },
    {
        ....
        "id": 2,
       ...
    },
     ...
]

I have an id, for example:

var id = 2;

I need to get the index of the object by this identifier, i.e.
If id = 2, then the index will be:

data[1]

How is it correct to iterate over and return the required index?

Answer 1

function getIndexById(arr, id) {
  var index = -1, length = arr.length, i = 0;  
  for (; i < length; i++) {
    if (arr[i]['id'] === id)  {
        index = i;
        break;
    }    
  }
  return index;
}

Answer 2

like this? jsfiddle.net/a5qpp8ry