AngularJS Example:

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<div ng-app="app" >
    <div dummy-directive></dummy-directive>
</div>

JavaScript

angular.module("app",[]);
angular.module("app").factory('dummyService',dummyService);

angular.module("app").directive('dummyDirective',['dummyService',dummyDirective]);

function dummyService(){
    return {
    	name : "hello"
    }
}

function dummyDirective(dummyService) {
    return {
        link:function(scope){
            console.log(dummyService.name);
        }
    }
}