Question

I’m attempting to write a function which updates a json key value if an attempt is made to add a new key with same name

So in fiddle – http://jsfiddle.net/adrianjsfiddlenetuser/C6Ssa/57/

When the button “Add” is clicked the jSon array toUpdate should be updated :

   name: "addThis2",
   id : 10   

should become

   name: "addThis2",
   id : 11  

This is not occuring ?

Sample JSON :

{
    "toAdd": [
        {
            "name": "addThis",
            "id": 10
        }
    ],
    "toRemove": [
        {
            "name": "removeThis"
        }
    ]
}

Answer 1

You should change the index of array like folowing:

var toUpdate = {
    toAdd: [],
    toRemove: []
};
toUpdate.toAdd[0].push({
    name: "addThis1",
    id: 10
});
toUpdate.toRemove[0].push({
    name: "removeThis1"
});
toUpdate.toAdd[1].push({
    name: "addThis2",
    id: 10
});
toUpdate.toRemove[1].push({
    name: "removeThis2"
});

Then you can try

$.each(toUpdate, function(index, data) {
   $.each(data, function(key, val) {  // here this refer to toAdd, toRemove..
    console.log(key);   // here this point key of object like name, id ...
    console.log(val[key]);  // output: addThis, addThis, removeThis
  });
});