[removed] Object Rename Key

Question

Is there a clever (i.e. optimized) way to rename a key in a javascript object?

A non-optimized way would be:

o[ new_key ] = o[ old_key ];
delete o[ o         


        

Answer 1

Your way is optimized, in my opinion. But you will end up with reordered keys. Newly created key will be appended at the end. I know you should never rely on key order, but if you need to preserve it, you will need to go through all keys and construct new object one by one, replacing the key in question during that process.

Like this:

var new_o={};
for (var i in o)
{
   if (i==old_key) new_o[new_key]=o[old_key];
   else new_o[i]=o[i];
}
o=new_o;