for loop in jquery function when first list is clicked on code example

Example 1: jquery each

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

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

Example 2: jquery foreach

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