Angular service returning object?

Question

As far as I understand Angularjs services are created by passing in a Contructor function:

app.service('serviceName', function(){
  this.var1 = 'foo';

  this.method1 =  function(){

   }
});

Angular runs this function with the new operator.

I was going through this service, and i don't see any "this" insider

https://github.com/shreya5/angular-facebook-utils/blob/master/src/scripts/facebookUser.js

Infact this function returns deferred.promise

Can someone shed some light on what's going on here ?

Benjamin Gruenbaum · Accepted Answer · 2014-08-02 09:00:22Z

1

You are free to choose whatever pattern you want. Just because angular runs your function with new doesn't obligate you to use this nor does it require you to return the default object.

For example, this is a pretty nice idiom that I use in Angular services a lot:

function myConstructor(me){  
    me = me || "Mark";
    return {
        name: me,
        sayit: function(){return "Say my name, " + me}
     };

 }
 var obj = new myConstructor("Steve");
 console.log(obj.sayit())
 console.log(obj.name)

edited Aug 2, 2014 at 9:00

Benjamin Gruenbaum

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answered Aug 1, 2014 at 23:03

Mark

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1 Comment

Roamer-1888 Over a year ago

As a formal parameter, me does not need to be redeclared with var. me = me || "Mark"; will do the job.

Fu Cheng · Accepted Answer · 2014-08-01 23:23:13Z

1

The value returned from service depends on how it will be used. You are free to return whatever you want. From another file where this facebookUser will be used, it's used as a promise, facebookUser.then.

facebookUser.then(function(user) {
    if (!user.loggedIn) {
       // reload the login route
       $location.path(facebookConfigSettings.loginPath || facebookConfigDefaults.loginPath);
    }
});

answered Aug 1, 2014 at 23:23

Fu Cheng

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