looping Array / structure in javascript OR looping Array / structure in jquery

 looping array/structure in jquery or in javascript. here is simple code from jquery. 

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>

<script>

//array
var mykids = new Array();
mykids[0]="kid1";     
mykids[1]="kid2";
mykids[2]="kid3";

$.each(mykids, function(index, value) {
  alert(index + ': ' + value);
});

/structure
var map = {
  'key 1': 'val1',
  'key 2': 'val2'
};
$.each(map, function(key, value) {
  alert(key + ': ' + value);
});

</script>