GraphQL : return new Promise((resolve,object)

Question

I've tried to figure it out myself, and google around, but i can't seem to find the answer anywhere, so I'll try my luck here.

I have this mutation, as below:

Mutation :{

            createFriend: (root,{ input }) => {

                const newFriend = new Friends({

                    firstName: input.firstName,
                    lastName: input.lastName,
                    gender: input.gender,
                    age: input.age,
                    language: input.language,
                    email: input.email,
                    contacts: input.contacts
                });

                newFriend.id = newFriend._id;

                return new Promise((resolve,object) =>{

                    newFriend.save((err) =>{

                        if(err) reject(err)
                        else resolve(newFriend)


                    })


                })
            }

What confuses me is the following snippet:

return new Promise((resolve,object) =>{

                newFriend.save((err) =>{

                    if(err) reject(err)
                    else resolve(newFriend)


                })


            }

What does "return new promise" do, and why does it have an object parameter inside, which i never seems to use?

Would be more than happy if someone could explain me what is going on.

Thank you in advance.

Answer 1

As pointed out by Bergi in the comments, it must be a mistake from teacher from the Lynda.com tutorial.

(resolve,reject) makes sense and it still works, so i'll close this question and say that Bergis answer is the solution.