jquery loop through each child element

$('#mydiv').children('input').each(function () {
    alert(this.value); // "this" is the current element in the loop
});

//Array
$.each( arr, function( index, value ){
    sum += value;
});

//Object
$.each( obj, function( key, value ) {
    sum += value;
});

$.each( obj, function( key, value ) {
  alert( key + ": " + value );
});