Change key in js associative array

Question

If I have:

var myArray = new Array();

myArray['hello'] = value;

How can I change the key 'hello' to something else?

Something like this would work.

var from = 'hello',
    to   = 'world',
    i, value = myArray[from];

for( i in myArray )
  if( i == from ) myArray.splice( i, 1 );

myArray[to] = value;

But is there a native function or a better way to do it?

edit:

Due to the lack of associative arrays in js, what I want to do modify the property name of an object as efficiently as possible.

Answer 1

In JavaScript there is no such thing as associative Array. Objects can be used instead:

var myHash = new Object();

or

var myHash = {};

replace can be done like this:

myHash["from"] = "value";
myHash["to"] = myHash["from"];
delete myHash["from"];

but the preferred way to write it:

myHash.from = "value";
myHash.to = myHash.from;
delete myHash.from;