filters.js

var serveryFilters = angular.module('serveryFilters', [])

serveryFilters.filter('dayofweek', function() {
  return function(input) {
    // Change this so that it return 'Sun' for input = 0 , 'Mon' for input = 1, .... , 'Sat' for input = 6
    // Use the javascript switch statement to do this: http://www.w3schools.com/js/js_switch.asp
    return input ? '\u2713' : '\u2718';
  };
});

You can add another filter to the file by adding the following code:

serveryFilters.filter('filtername', function () {
  return function(input) {
    // Filter code goes here
  };
});