Javascript custom sorting node run instance

var studs = [{name: 'clap', age: 15}, 
             {name: 'martin', age: 13},
             {name: 'merry', age: 10}];

function sortbyage(a, b)
{
//Arrange from young to older
  return > ;
}

function sortbyname(a, b)
{
  return > ;
}

//Sorted by age
(sortbyage);
for(var i = 0; i < ; i++)
  (studs[i]);

//Sort by name
(sortbyname);
for(var i = 0; i < ; i++)
  (studs[i]);