How to get name of current JSON property while iterating through them in JavaScript?

Question

I have JSON object inside variable like this:

var chessPieces = {
    "p-w-1" : {
        "role":"pawn",
        "position":{"x":1, "y":2},
        "state":"free",
        "virgin":"yes"
    },
    "p-w-2" : {
        "role":"pawn",
        "position":{"x":2, "y":2},
        "state":"free",
        "virgin":"yes"
    },...
};

And I'm iterating trough them with for each loop:

for (var piece in chessPieces){
    //some code
}

How would I get current pieces name from this? For example, we are currently on the first element(piece = 0): chessPiece[piece].GiveMeTheName ==> which results in string "p-w-1".

I actually intend to pass the current element into the function, cos I need to check something, so it would look something like this:

//constructor for this function looks like this: function setPiece(piece,x,y);
function setPiece(chessPiece[piece],chessPiece[piece].position.x,chessPiece[piece].position.y){
    //and here I need to get something like
    piece.GiveMeTheName ==> which gives me string "p-w-1"
}

I'm also using jQuery in my project, so if there's something usable in that library, let me know.

Answer 1

I'd use $.each(obj, fn). The function allows access to the object key of the current element.

$.each(chessPieces, function(key, value) {

   //key = "p-w-1"
   //value = { "role":"pawn", ... }
   //this === value

});