How to avoid output arguments in Javascript

[GOKHAN DILEK]

Hi,

I have 3 parameter function below.

function authenticateUser(username, password, callback) {
 userGateway.verifyUser(username, password, function (data) {
 callback(data);
 });
}

I am trying to find a way to prevent the third parameter - the callback parameter in javascript.

Couple of problems with this function:

1- It has 3 parameters.

2- Callback parameter is output parameter which causes double take.

Anyone else had similar issue?

[recep yalman]

You can use promise if you wish.  

function authenticateUser(username,password){

    return new Promise(function(resolve,reject){ 

        userGateway.verifyUser(username,password, resolve);

     }

}

usage:

authenticateUser("aUserName","secret").then(function(data){

   //do something here 

})

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[Łukasz Duda]

You can group user name and password into credentials object.
var credentials = { userName: "abc", password: "def" };
authenticateUser(credentials, callback);