scratch

angular.module('foo')
    .factory('kak', function kak() {
        'use strict';
        
        /* ... */
    });

// vs 
(function () {
    
    'use strict';

    angular.module('foo', [])
        .factory('fooSearch', fooSearch);

    function fooSearch(){
        
        /* ... */
        
    }
    
}());

// vs
(function () {
    
    'use strict';
    angular.module('foo', [])
        .factory('fooSearch', function fooSearch(){
    
            /* ... */
            
        });
})();