Changing the case of JavaScript object keys

Question

I have following object.

var obj = [{
  Address1: "dd",
  Address2: "qww",
  BankAccNo: "44",
  BankBranchCode: "44",
  BloodGrp: "A+"
},
{
  Address1: "dd",
  Address2: "qww",
  BankAccNo: "44",
  BankBranchCode: "44",
  BloodGrp: "A+"
}];

How can I make all of the keys uppercase?

I want to be able to access values like this : - obj[0].ADDRESS1

Answer 1

obj = obj.map( function( item ){
    for(var key in item){
        var upper = key.toUpperCase();
        // check if it already wasn't uppercase
        if( upper !== key ){ 
            item[ upper ] = item[key];
            delete item[key];
        }
    }
    return item;
});

http://jsfiddle.net/07xortqy/

Answer 2

1. Loop over all the properties in the object (with for in)
2. Use .toUpperCase() to get the uppercase version of the property name
3. Copy the value from the original property to the uppercase version
4. delete the original property